diff --git a/README.md b/README.md
index cd31809..da8a7f2 100644
--- a/README.md
+++ b/README.md
@@ -71,7 +71,7 @@ Snow 语言受到 LLM 驱动代码生成趋势的启发,强调简单而清晰的
 ## 相关文档
 [Snow-Lang 指南](docs/Snow-Lang-Syntax/Snow-Lang-Syntax.md)
 
-[Snow-Lang 语法规范](docs/Snow-Lang-Syntax/Snow-Lang-Grammar-Specification)
+[Snow-Lang 语法规范](docs/Snow-Lang-Syntax/Snow-Lang-Grammar-Specification.md)
 
 
 [Git 管理规范](docs/Snow-Lang-Git-Management/Snow-Lang-Git-Management.md)
diff --git a/docs/Snow-Lang-Syntax/Snow-Lang-Grammar-Specification.md b/docs/Snow-Lang-Syntax/Snow-Lang-Grammar-Specification.md
index d8a816a..64d2af4 100644
--- a/docs/Snow-Lang-Syntax/Snow-Lang-Grammar-Specification.md
+++ b/docs/Snow-Lang-Syntax/Snow-Lang-Grammar-Specification.md
@@ -321,10 +321,8 @@ Snow-Lang 支持下列**数值类型**，用于声明变量、参数、结构体
 |----|--------|----------|
 | b  | byte   | 7b, -2B  |
 | s  | short  | 123s     |
-| i  | int    | 100i     |
 | l  | long   | 5l, 123L |
 | f  | float  | 3.14f    |
-| d  | double | 1.0d     |
 
 - 没有后缀的整数字面量自动为 `int`。
 - 没有后缀的浮点字面量自动为 `double`。
diff --git a/playground/Demo/Demo13/Main.snow b/playground/Demo/Demo13/Main.snow
index dee7b5b..7b6479b 100644
--- a/playground/Demo/Demo13/Main.snow
+++ b/playground/Demo/Demo13/Main.snow
@@ -7,34 +7,34 @@ module: Main
             5 == 7b
             5 == 7l
             5 == 7f
-            5 == 7d
+            5 == 7.0
 
             5b == 5b
             5b == 5s
             5b == 5l
             5b == 5f
-            5b == 5d
+            5b == 5.0
 
             5s == 5s
             5s == 5l
             5s == 5f
-            5s == 5d
+            5s == 5.0
 
             5l == 5l
             5l == 5f
-            5l == 5d
+            5l == 5.0
 
             5f == 5f
-            5f == 5d
+            5f == 5.0
 
-            5d == 5d
+            5.0 == 5.0
 
             declare b: byte = 8b
             declare s: short = 8s
             declare i: int = 8
             declare l: long = 8l
             declare f: float = 8f
-            declare d: double = 8d
+            declare d: double = 8
 
             b == b
             b == s
diff --git a/src/main/java/org/jcnc/snow/compiler/lexer/scanners/NumberTokenScanner.java b/src/main/java/org/jcnc/snow/compiler/lexer/scanners/NumberTokenScanner.java
index c655595..7cd0894 100644
--- a/src/main/java/org/jcnc/snow/compiler/lexer/scanners/NumberTokenScanner.java
+++ b/src/main/java/org/jcnc/snow/compiler/lexer/scanners/NumberTokenScanner.java
@@ -42,7 +42,7 @@ import org.jcnc.snow.compiler.lexer.token.TokenType;
  *   <li>小数点后缺失数字（如 1.）—— 抛出 LexicalException</li>
  * </ol>
  * <p>
- * 支持的单字符类型后缀包括: b, s, l, f, d 及其大写形式。若需支持多字符后缀，可将该集合扩展为 Set<String>。
+ * 支持的单字符类型后缀包括: b, s, l, f 及其大写形式。若需支持多字符后缀，可将该集合扩展为 Set<String>。
  */
 public class NumberTokenScanner extends AbstractTokenScanner {
 
@@ -51,7 +51,7 @@ public class NumberTokenScanner extends AbstractTokenScanner {
      * 包含: b, s, l, f, d 及其大写形式。
      * 对于多字符后缀，可扩展为 Set<String> 并在扫描尾部做贪婪匹配。
      */
-    private static final String SUFFIX_CHARS = "bslfdBSLFD";
+    private static final String SUFFIX_CHARS = "bslfBSLF";
 
     /**
      * 判断是否由该扫描器处理。
@@ -177,8 +177,10 @@ public class NumberTokenScanner extends AbstractTokenScanner {
 
                 /* 2-B. **非法字母**（既不是后缀，也没有空白隔开） */
             } else if (Character.isLetter(next)) {
+                var its = new IdentifierTokenScanner();
+                var token = its.scanToken(ctx, line, col);
                 throw new LexicalException(
-                        "数字后不能紧跟未知标识符 '" + next + "'", line, col);
+                        "数字后不能紧跟未知标识符 '" + token.getLexeme() + "'", line, col);
                 /* 2-C. **非法下划线** */
             } else if (next == '_') {
                 throw new LexicalException(