diff --git a/Lazy.Captcha.Core/CaptchaOptions.cs b/Lazy.Captcha.Core/CaptchaOptions.cs
index 12ad5ed3b819bcbd2c149eeebbddfa61e5c3e971..c4aefce51b3411815c8b0e291659430e94ecf394 100644
--- a/Lazy.Captcha.Core/CaptchaOptions.cs
+++ b/Lazy.Captcha.Core/CaptchaOptions.cs
@@ -28,7 +28,7 @@ namespace Lazy.Captcha.Core
 
                 if (value.ContainsChinese())
                 {
-                    this.ImageOption.FontFamily = DefaultFontFamilies.Instance.Kaiti;
+                    this.ImageOption.FontFamily = DefaultFontFamilies.Kaiti;
                 }
 
                 _captchaType = value;
diff --git a/Lazy.Captcha.Core/CaptchaService.cs b/Lazy.Captcha.Core/CaptchaService.cs
index 9809d2bf70577fd2ec5e21afe39022733de250ce..c94ef660bfaf0ffeeb188025c07d8f26335518e6 100644
--- a/Lazy.Captcha.Core/CaptchaService.cs
+++ b/Lazy.Captcha.Core/CaptchaService.cs
@@ -34,7 +34,7 @@ namespace Lazy.Captcha.Core
         public virtual CaptchaData Generate(string captchaId, int? expirySeconds = null)
         {
             var _captchaCodeGenerator = GetCodeGenerator();
-            var _captchaImageGenerator = GetImmageGenerator();
+            var _captchaImageGenerator = GetImageGenerator();
 
             var (renderText, code) = _captchaCodeGenerator.Generate(CaptchaOptions.CodeLength);
             var image = _captchaImageGenerator.Generate(renderText, CaptchaOptions.ImageOption);
@@ -102,7 +102,7 @@ namespace Lazy.Captcha.Core
             }
         }
 
-        protected virtual ICaptchaImageGenerator GetImmageGenerator()
+        protected virtual ICaptchaImageGenerator GetImageGenerator()
         {
             return new DefaultCaptchaImageGenerator();
         }
diff --git a/Lazy.Captcha.Core/CaptchaServiceBuilder.cs b/Lazy.Captcha.Core/CaptchaServiceBuilder.cs
index 8d807b470534f37fd97da41850de8fd49b7549a7..37636f9ce4bb0cd409db847d3ac129e8ddc9b3a2 100644
--- a/Lazy.Captcha.Core/CaptchaServiceBuilder.cs
+++ b/Lazy.Captcha.Core/CaptchaServiceBuilder.cs
@@ -35,7 +35,7 @@ namespace Lazy.Captcha.Core
             var options = new CaptchaOptions();
             options.ImageOption.Width = 98;
             options.ImageOption.Height = 35;
-            options.ImageOption.ForegroundColors = DefaultColors.Instance.Colors;
+            options.ImageOption.ForegroundColors = DefaultColors.Colors;
             return options;
         }
 
diff --git a/Lazy.Captcha.Core/CaptchaServiceCollectionExtensions.cs b/Lazy.Captcha.Core/CaptchaServiceCollectionExtensions.cs
index 51437aee3b8834dc434b52d3436b1a20dc263b9d..718351d79c6ca124a559a219b2be303b71689ee4 100644
--- a/Lazy.Captcha.Core/CaptchaServiceCollectionExtensions.cs
+++ b/Lazy.Captcha.Core/CaptchaServiceCollectionExtensions.cs
@@ -34,7 +34,7 @@ namespace Microsoft.Extensions.DependencyInjection
                 var fontFamily = configuration?.GetSection("CaptchaOptions:ImageOption:FontFamily")?.Value;
                 if (!string.IsNullOrWhiteSpace(fontFamily))
                 {
-                    options.ImageOption.FontFamily = DefaultFontFamilies.Instance.GetFontFamily(fontFamily);
+                    options.ImageOption.FontFamily = DefaultFontFamilies.GetFontFamily(fontFamily);
                 }
 
                 var backgroundColor = configuration?.GetSection("CaptchaOptions:ImageOption:BackgroundColor")?.Value;
@@ -62,9 +62,9 @@ namespace Microsoft.Extensions.DependencyInjection
                         }
                     }
                 }
-                if (options.ImageOption.ForegroundColors == null || options.ImageOption.ForegroundColors.Count() == 0)
+                if (options.ImageOption.ForegroundColors == null || options.ImageOption.ForegroundColors.Count == 0)
                 {
-                    options.ImageOption.ForegroundColors = DefaultColors.Instance.Colors;
+                    options.ImageOption.ForegroundColors = DefaultColors.Colors;
                 }
             });
             if (optionsAction != null) services.PostConfigure(optionsAction);
diff --git a/Lazy.Captcha.Core/CaptchaType.cs b/Lazy.Captcha.Core/CaptchaType.cs
index 9228795fccee38ced2e187f24fa0821950c94f26..a78ee35db4679739b98da7124dc65da87ab82b83 100644
--- a/Lazy.Captcha.Core/CaptchaType.cs
+++ b/Lazy.Captcha.Core/CaptchaType.cs
@@ -11,61 +11,61 @@ namespace Lazy.Captcha.Core.Generator
         /// <summary>
         /// 默认(英文字符大小写，数字混合)
         /// </summary>
-        DEFAULT=0,
+        DEFAULT = 0,
 
         /// <summary>
         /// 中文
         /// </summary>
-        CHINESE=1,
+        CHINESE = 1,
 
         /// <summary>
         /// 数字
         /// </summary>
-        NUMBER=2,
+        NUMBER = 2,
 
         /// <summary>
         /// 中文数字小写
         /// </summary>
-        NUMBER_ZH_CN=3,
+        NUMBER_ZH_CN = 3,
 
         /// <summary>
         /// 中文数字大写
         /// </summary>
-        NUMBER_ZH_HK=4,
+        NUMBER_ZH_HK = 4,
 
         /// <summary>
         /// 英文字符大小写混合
         /// </summary>
-        WORD=5,
+        WORD = 5,
 
         /// <summary>
         /// 英文字符小写
         /// </summary>
-        WORD_LOWER=6,
+        WORD_LOWER = 6,
 
         /// <summary>
         /// 英文字符大写
         /// </summary>
-        WORD_UPPER=7,
+        WORD_UPPER = 7,
 
         /// <summary>
         /// 英文小写，数字混合
         /// </summary>
-        WORD_NUMBER_LOWER=8,
+        WORD_NUMBER_LOWER = 8,
 
         /// <summary>
         /// 英文大写，数字混合
         /// </summary>
-        WORD_NUMBER_UPPER=9,
+        WORD_NUMBER_UPPER = 9,
 
         /// <summary>
         /// 数字计算
         /// </summary>
-        ARITHMETIC=10,
+        ARITHMETIC = 10,
 
         /// <summary>
         /// 数字计算，中文
         /// </summary>
-        ARITHMETIC_ZH=11
+        ARITHMETIC_ZH = 11
     }
 }
\ No newline at end of file
diff --git a/Lazy.Captcha.Core/DefaultColors.cs b/Lazy.Captcha.Core/DefaultColors.cs
index 0a0d8aa35ffced3c7656ce504b97dda28c2370df..1cf51993c6ac889a2d5ef4c881ede704932f428b 100644
--- a/Lazy.Captcha.Core/DefaultColors.cs
+++ b/Lazy.Captcha.Core/DefaultColors.cs
@@ -9,10 +9,10 @@ namespace Lazy.Captcha.Core
 {
     public class DefaultColors
     {
-        public static DefaultColors Instance = new DefaultColors();
+        public static readonly DefaultColors Instance = new DefaultColors();
 
-        public List<SKColor> Colors = new List<SKColor>
-        {
+        public static List<SKColor> Colors { get; private set; } =
+        [
             SKColor.Parse("#0087ff"),
             SKColor.Parse("#339933"),
             SKColor.Parse("#ff6666"),
@@ -24,7 +24,7 @@ namespace Lazy.Captcha.Core
             SKColor.Parse("#0066cc"),
             SKColor.Parse("#cc3333"),
             SKColor.Parse("#0099cc"),
-            SKColor.Parse("#003366"),
-        };
+            SKColor.Parse("#003366")
+        ];
     }
 }
diff --git a/Lazy.Captcha.Core/DefaultFontFamilies.cs b/Lazy.Captcha.Core/DefaultFontFamilies.cs
index e6bb12d71eb78082aac4f42ece36c7627c28c271..415eb87c883c15aa9651a74685a2cb2b0b449bff 100644
--- a/Lazy.Captcha.Core/DefaultFontFamilies.cs
+++ b/Lazy.Captcha.Core/DefaultFontFamilies.cs
@@ -11,7 +11,7 @@ namespace Lazy.Captcha.Core
         public static readonly DefaultFontFamilies Instance = new DefaultFontFamilies();
         private static readonly List<SKTypeface> _fontFamilies = [];
 
-        private static readonly Dictionary<string, string> FamilyNameMapper = new Dictionary<string, string>
+        private static Dictionary<string, string> FamilyNameMapper { get; set; } = new()
         {
             { "actionj", "Action Jackson" },
             { "epilog", "Epilog" },
@@ -48,7 +48,7 @@ namespace Lazy.Captcha.Core
         /// <summary>
         /// 获取字体
         /// </summary>
-        public SKTypeface GetFontFamily(string name)
+        public static SKTypeface GetFontFamily(string name)
         {
             var realName = "Epilog";
             var normalizeName = name.ToLowerInvariant();
@@ -65,57 +65,57 @@ namespace Lazy.Captcha.Core
         /// <summary>
         /// ACTIONJ
         /// </summary>
-        public SKTypeface Actionj => GetFontFamily("Actionj");
+        public static SKTypeface Actionj => GetFontFamily("Actionj");
 
         /// <summary>
         /// Epilog
         /// </summary>
-        public SKTypeface Epilog => GetFontFamily("Epilog");
+        public static SKTypeface Epilog => GetFontFamily("Epilog");
 
         /// <summary>
         /// Fresnel
         /// </summary>
-        public SKTypeface Fresnel => GetFontFamily("Fresnel");
+        public static SKTypeface Fresnel => GetFontFamily("Fresnel");
 
         /// <summary>
         /// headache
         /// </summary>
-        public SKTypeface Headache => GetFontFamily("Headache");
+        public static SKTypeface Headache => GetFontFamily("Headache");
 
         /// <summary>
         /// Lexo
         /// </summary>
-        public SKTypeface Lexo => GetFontFamily("Lexo");
+        public static SKTypeface Lexo => GetFontFamily("Lexo");
 
         /// <summary>
         /// Prefix
         /// </summary>
-        public SKTypeface Prefix => GetFontFamily("Prefix");
+        public static SKTypeface Prefix => GetFontFamily("Prefix");
 
         /// <summary>
         /// Progbot
         /// </summary>
-        public SKTypeface Progbot => GetFontFamily("Progbot");
+        public static SKTypeface Progbot => GetFontFamily("Progbot");
 
         /// <summary>
         /// Ransom
         /// </summary>
-        public SKTypeface Ransom => GetFontFamily("Ransom");
+        public static SKTypeface Ransom => GetFontFamily("Ransom");
 
         /// <summary>
         /// Robot
         /// </summary>
-        public SKTypeface Robot => GetFontFamily("Robot");
+        public static SKTypeface Robot => GetFontFamily("Robot");
 
         /// <summary>
         /// Scandal
         /// </summary>
-        public SKTypeface Scandal => GetFontFamily("Scandal");
+        public static SKTypeface Scandal => GetFontFamily("Scandal");
 
         /// <summary>
         /// 楷体
         /// </summary>
-        public SKTypeface Kaiti => GetFontFamily("Kaiti");
+        public static SKTypeface Kaiti => GetFontFamily("Kaiti");
     }
 
     [Obsolete("拼写错误。请使用 `DefaultFontFamilies` 代替。")]
diff --git a/Lazy.Captcha.Core/Generator/Image/Option/CaptchaImageGeneratorOption.cs b/Lazy.Captcha.Core/Generator/Image/Option/CaptchaImageGeneratorOption.cs
index 99bfd724c3361e3b6107355a41911d666c82f92c..234f056d9922bb608e7e5d5c9d9313f9ed4a12c2 100644
--- a/Lazy.Captcha.Core/Generator/Image/Option/CaptchaImageGeneratorOption.cs
+++ b/Lazy.Captcha.Core/Generator/Image/Option/CaptchaImageGeneratorOption.cs
@@ -24,7 +24,7 @@ namespace Lazy.Captcha.Core.Generator.Image.Option
         /// <summary>
         /// FontFamily
         /// </summary>
-        public SKTypeface FontFamily { get; set;}= DefaultFontFamilies.Instance.Kaiti;
+        public SKTypeface FontFamily { get; set;} = DefaultFontFamilies.Kaiti;
         /// <summary>
         /// 字体大小
         /// </summary>
diff --git a/README.md b/README.md
index 7dbafd127b1271e44cf282e985ca7d1c18cd5351..978dfa59ee21a38c0e2cc977dd8de98c2c7cd3f5 100644
--- a/README.md
+++ b/README.md
@@ -133,7 +133,7 @@ builder.Services.AddCaptcha(builder.Configuration);
 
 ##### 代码配置
 
-``` c#
+``` csharp
 // 全部配置
 builder.Services.AddCaptcha(builder.Configuration, option =>
     option.CaptchaType = CaptchaType.WORD; // 验证码类型
@@ -157,7 +157,7 @@ builder.Services.AddCaptcha(builder.Configuration, option =>
     option.ImageOption.InterferenceLineCount = 2; // 干扰线数量
 
     option.ImageOption.FontSize = 36; // 字体大小
-    option.ImageOption.FontFamily = DefaultFontFamilys.Instance.Actionj; // 字体
+    option.ImageOption.FontFamily = DefaultFontFamilys.Actionj; // 字体
     
     /* 
      * 中文使用kaiti，其他字符可根据喜好设置（可能部分转字符会出现绘制不出的情况）。
@@ -171,7 +171,6 @@ builder.Services.AddCaptcha(builder.Configuration, option =>
 #### 3. Controller
 
 ```csharp
-
 [Route("captcha")]
 [ApiController]
 public class CaptchaController : Controller
@@ -228,7 +227,7 @@ public class CaptchaController : Controller
 
 ##### 配置文件方式
 
-```json
+```json5
 {
   "CaptchaOptions": {
     "RateLimit": {
@@ -387,12 +386,12 @@ public class RandomCaptcha : DefaultCaptcha
         // 如果包含中文时，使用kaiti字体，否则文字乱码
         if (options.CaptchaType.ContainsChinese())
         {
-            options.ImageOption.FontFamily = DefaultFontFamilys.Instance.Kaiti;
+            options.ImageOption.FontFamily = DefaultFontFamilys.Kaiti;
             options.ImageOption.FontSize = 24;
         }
         else
         {
-            options.ImageOption.FontFamily = DefaultFontFamilys.Instance.Actionj;
+            options.ImageOption.FontFamily = DefaultFontFamilys.Actionj;
         }
 
         // 动静随机
@@ -459,7 +458,7 @@ public class ResourceFontFamilysFinder
 ```
 
 #### 4. 设置option
-``` c#
+``` csharp
 // 内存存储， 基于appsettings.json配置
 builder.Services.AddCaptcha(builder.Configuration, options =>
 {
@@ -476,7 +475,7 @@ builder.Services.AddCaptcha(builder.Configuration, options =>
 先安装SkiaSharp, 再安装Lazy.Captcha.Core
 
 #### 2. Global.asax增加
-``` c#
+``` csharp
 public class MvcApplication : System.Web.HttpApplication
 {
     protected void Application_Start()
@@ -496,7 +495,7 @@ public class MvcApplication : System.Web.HttpApplication
             .Height(35)
             .FontSize(20)
             .CaptchaType(CaptchaType.ARITHMETIC)
-            .FontFamily(DefaultFontFamilys.Instance.Ransom)
+            .FontFamily(DefaultFontFamilys.Ransom)
             .InterferenceLineCount(3)
             .Animation(false)
             .Build();
@@ -506,7 +505,7 @@ public class MvcApplication : System.Web.HttpApplication
 ```
 
 #### 3. Controller使用
-``` c#
+``` csharp
 public class CaptchaController : Controller
 {
     [HttpGet]
@@ -570,7 +569,7 @@ var imageGenerator = new DefaultCaptchaImageGenerator();
 var imageGeneratorOption = new CaptchaImageGeneratorOption()
 {
     // 必须设置
-    ForegroundColors = DefaultColors.Instance.Colors
+    ForegroundColors = DefaultColors.Colors
 };
 var bytes = imageGenerator.Generate("hello", imageGeneratorOption);
 ```
diff --git a/Sample.MvcFramework/Global.asax.cs b/Sample.MvcFramework/Global.asax.cs
index 7034b72671e411802e9fe9ed97d79023a429c8d6..0e87994391df576035eb462949c2e56915d7eeec 100644
--- a/Sample.MvcFramework/Global.asax.cs
+++ b/Sample.MvcFramework/Global.asax.cs
@@ -31,7 +31,7 @@ namespace Sample.MvcFramework
                .Height(35)
                .FontSize(20)
                .CaptchaType(CaptchaType.ARITHMETIC)
-               .FontFamily(DefaultFontFamilies.Instance.Ransom)
+               .FontFamily(DefaultFontFamilies.Ransom)
                .InterferenceLineCount(3)
                .Animation(false)
                .Build();
diff --git a/Sample.NetCore/Controllers/CaptchaController.cs b/Sample.NetCore/Controllers/CaptchaController.cs
index decd6889d3cca7d3d0cc70ccdaf9fc098c6731e9..15970b84c7f312bf8cee5e48bdfa88f2b1cc251f 100644
--- a/Sample.NetCore/Controllers/CaptchaController.cs
+++ b/Sample.NetCore/Controllers/CaptchaController.cs
@@ -131,7 +131,7 @@ namespace Sample.NetCore.Controllers
               .Height(35)
               .FontSize(26)
               .CaptchaType(Enum.Parse<CaptchaType>(type))
-              .FontFamily(DefaultFontFamilies.Instance.GetFontFamily(font))
+              .FontFamily(DefaultFontFamilies.GetFontFamily(font))
               .InterferenceLineCount(2)
               .Animation(false)
               .TextBold(textBold)
@@ -153,7 +153,7 @@ namespace Sample.NetCore.Controllers
             var imageGeneratorOption = new CaptchaImageGeneratorOption()
             {
                 // 字体颜色
-                ForegroundColors = DefaultColors.Instance.Colors
+                ForegroundColors = DefaultColors.Colors
             };
             var bytes = imageGenerator.Generate("hello", imageGeneratorOption);
             var stream = new MemoryStream(bytes);
diff --git a/Sample.NetCore/RandomCaptcha.cs b/Sample.NetCore/RandomCaptcha.cs
index 91ff3046151d927b370c331533d8df9f5d9a963b..ecb6bd68f5bd0110ae809377f91e0b3235f277ff 100644
--- a/Sample.NetCore/RandomCaptcha.cs
+++ b/Sample.NetCore/RandomCaptcha.cs
@@ -39,12 +39,12 @@ namespace Sample.NetCore
             // 如果包含中文时，使用kaiti字体，否则文字乱码
             if (options.CaptchaType.ContainsChinese())
             {
-                options.ImageOption.FontFamily = DefaultFontFamilies.Instance.Kaiti;
+                options.ImageOption.FontFamily = DefaultFontFamilies.Kaiti;
                 options.ImageOption.FontSize = 24;
             }
             else
             {
-                options.ImageOption.FontFamily = DefaultFontFamilies.Instance.Actionj;
+                options.ImageOption.FontFamily = DefaultFontFamilies.Actionj;
             }
 
             // 动静随机
diff --git a/Sample.Winfrom/OptionProviders/FontFamilyOptionProvider.cs b/Sample.Winfrom/OptionProviders/FontFamilyOptionProvider.cs
index c883fd19801441da66f458d826943602d62edbe9..7db7606b8753c2a9eee146463909cb83353a572a 100644
--- a/Sample.Winfrom/OptionProviders/FontFamilyOptionProvider.cs
+++ b/Sample.Winfrom/OptionProviders/FontFamilyOptionProvider.cs
@@ -14,17 +14,17 @@ namespace Sample.Winfrom.OptionProviders
         {
             return new List<FontFamilyOption>
             {
-                new FontFamilyOption("Actionj", DefaultFontFamilies.Instance.Actionj),
-                new FontFamilyOption("Kaiti", DefaultFontFamilies.Instance.Kaiti),
-                new FontFamilyOption("Fresnel", DefaultFontFamilies.Instance.Fresnel),
-                new FontFamilyOption("Prefix", DefaultFontFamilies.Instance.Prefix),
-                new FontFamilyOption("Ransom", DefaultFontFamilies.Instance.Ransom),
-                new FontFamilyOption("Scandal", DefaultFontFamilies.Instance.Scandal),
-                new FontFamilyOption("Epilog", DefaultFontFamilies.Instance.Epilog),
-                new FontFamilyOption("Headache", DefaultFontFamilies.Instance.Headache),
-                new FontFamilyOption("Lexo", DefaultFontFamilies.Instance.Lexo),
-                new FontFamilyOption("Progbot", DefaultFontFamilies.Instance.Progbot),
-                new FontFamilyOption("Robot", DefaultFontFamilies.Instance.Robot),
+                new FontFamilyOption("Actionj", DefaultFontFamilies.Actionj),
+                new FontFamilyOption("Kaiti", DefaultFontFamilies.Kaiti),
+                new FontFamilyOption("Fresnel", DefaultFontFamilies.Fresnel),
+                new FontFamilyOption("Prefix", DefaultFontFamilies.Prefix),
+                new FontFamilyOption("Ransom", DefaultFontFamilies.Ransom),
+                new FontFamilyOption("Scandal", DefaultFontFamilies.Scandal),
+                new FontFamilyOption("Epilog", DefaultFontFamilies.Epilog),
+                new FontFamilyOption("Headache", DefaultFontFamilies.Headache),
+                new FontFamilyOption("Lexo", DefaultFontFamilies.Lexo),
+                new FontFamilyOption("Progbot", DefaultFontFamilies.Progbot),
+                new FontFamilyOption("Robot", DefaultFontFamilies.Robot),
             };
         }
     }