diff --git a/inc/hgl/CodePage.h b/inc/hgl/CodePage.h
index 7e79e70..1e21bcc 100644
--- a/inc/hgl/CodePage.h
+++ b/inc/hgl/CodePage.h
@@ -145,13 +145,13 @@ namespace hgl
             hgl::strcpy(charset,CHAR_SET_NAME_MAX_LENGTH,"us-ascii");
         }
 
-        CharSet(uint16 ccp,const char *cs)
+        CharSet(const uint16 ccp,const char *cs)
         {
             codepage=ccp;
             hgl::strcpy(charset,CHAR_SET_NAME_MAX_LENGTH,cs);
         }
 
-        CharSet(uint16);
+        CharSet(const uint16);
         CharSet(const u8char *);
 
         CharSet(const CodePageAndCharSet &cs)
@@ -164,7 +164,7 @@ namespace hgl
         CompOperator(const CharSet &,_Comp)
     };//struct CharacterSet
 
-    inline CharSet::CharSet(uint16 ccp)
+    inline CharSet::CharSet(const uint16 ccp)
     {
         codepage=ccp;
         hgl::strcpy(charset,CHAR_SET_NAME_MAX_LENGTH,FindCharSet(ccp));
diff --git a/inc/hgl/Endian.h b/inc/hgl/Endian.h
index c0e42f8..195d7d0 100644
--- a/inc/hgl/Endian.h
+++ b/inc/hgl/Endian.h
@@ -12,7 +12,7 @@ namespace hgl
         * 全部Windows所支持代码页请参见 http://msdn.microsoft.com/en-us/library/dd317756
         *                            https://docs.microsoft.com/en-us/windows/win32/intl/code-page-identifiers
         */
-        enum class CharCodePage                         ///代码页枚举
+        enum class CharCodePage:uint16                  ///代码页枚举
         {
             NONE=0,                                     ///<起始定义，无意义