diff --git a/diboot-core/src/main/java/com/diboot/core/service/impl/DictionaryServiceImpl.java b/diboot-core/src/main/java/com/diboot/core/service/impl/DictionaryServiceImpl.java
index c48896b..00a829b 100644
--- a/diboot-core/src/main/java/com/diboot/core/service/impl/DictionaryServiceImpl.java
+++ b/diboot-core/src/main/java/com/diboot/core/service/impl/DictionaryServiceImpl.java
@@ -62,7 +62,6 @@ public class DictionaryServiceImpl extends BaseServiceImpl<DictionaryMapper, Dic
         if(V.isEmpty(voList)){
             return;
         }
-        getFieldName = S.toLowerCaseCamel(getFieldName);
         bindingFieldTo(voList)
                 .link(FIELD_NAME_ITEM_NAME, setFieldName)
                 .joinOn(getFieldName, FIELD_NAME_ITEM_VALUE)
@@ -100,4 +99,4 @@ public class DictionaryServiceImpl extends BaseServiceImpl<DictionaryMapper, Dic
 
         return true;
     }
-}
+}
\ No newline at end of file
diff --git a/diboot-core/src/main/java/com/diboot/core/util/S.java b/diboot-core/src/main/java/com/diboot/core/util/S.java
index 5c656d0..a63a176 100644
--- a/diboot-core/src/main/java/com/diboot/core/util/S.java
+++ b/diboot-core/src/main/java/com/diboot/core/util/S.java
@@ -111,7 +111,7 @@ public class S extends StringUtils{
 	}
 
 	/***
-	 * 转换成蛇形命名（用于Java属性转换为数据库列名）
+	 * 转换成小写蛇形命名（用于Java属性转换为小写数据库列名）
 	 * @param camelCaseStr
 	 * @return
 	 */
@@ -126,11 +126,8 @@ public class S extends StringUtils{
 				if(sb.length() > 0){
 					sb.append(Cons.SEPARATOR_UNDERSCORE);
 				}
-				sb.append(Character.toLowerCase(c));
-			}
-			else{
-				sb.append(c);
 			}
+			sb.append(Character.toLowerCase(c));
 		}
 		return sb.toString();
 	}
@@ -144,27 +141,31 @@ public class S extends StringUtils{
 		if(V.isEmpty(snakeCaseStr)){
 			return null;
 		}
-		// 不包含_，直接return
+		// 不包含_
 		if(!snakeCaseStr.contains(Cons.SEPARATOR_UNDERSCORE)){
-			return snakeCaseStr;
-		}
-		char[] chars = snakeCaseStr.toCharArray();
-		StringBuilder sb = new StringBuilder();
-		boolean upperCase = false;
-		for (char c : chars){
-			if(Cons.SEPARATOR_UNDERSCORE.equals(Character.toString(c))){
-				upperCase = true;
-				continue;
-			}
-			if(upperCase){
-				sb.append(Character.toUpperCase(c));
-				upperCase = false;
+			// 全大写直接return小写
+			if(snakeCaseStr.toUpperCase().equals(snakeCaseStr)){
+				return snakeCaseStr.toLowerCase();
 			}
+			// 其他return 首字母小写
 			else{
-				sb.append(c);
+				return uncapFirst(snakeCaseStr);
 			}
 		}
-		return sb.toString();
+		// 包含_
+		String result = null;
+		String[] words = snakeCaseStr.split(Cons.SEPARATOR_UNDERSCORE);
+		for(String word : words){
+			if(V.notEmpty(word)){
+				if(result == null){
+					result = word.toLowerCase();
+				}
+				else{
+					result += word.substring(0, 1).toUpperCase() + word.substring(1).toLowerCase();
+				}
+			}
+		}
+		return result;
 	}
 
 	/***
@@ -285,7 +286,7 @@ public class S extends StringUtils{
 	 */
 	public static String uncapFirst(String input){
 		if(input != null){
-			return String.valueOf(input.charAt(0)).toLowerCase() + input.substring(1);
+			return Character.toLowerCase(input.charAt(0)) + input.substring(1);
 		}
 		return null;
 	}
@@ -296,7 +297,7 @@ public class S extends StringUtils{
 	 */
 	public static String capFirst(String input){
 		if(input != null){
-			return String.valueOf(input.charAt(0)).toUpperCase() + input.substring(1);
+			return Character.toUpperCase(input.charAt(0)) + input.substring(1);
 		}
 		return null;
 	}
diff --git a/diboot-core/src/test/java/diboot/core/test/util/STest.java b/diboot-core/src/test/java/diboot/core/test/util/STest.java
index 729da6b..3e89a14 100644
--- a/diboot-core/src/test/java/diboot/core/test/util/STest.java
+++ b/diboot-core/src/test/java/diboot/core/test/util/STest.java
@@ -14,9 +14,10 @@ public class STest {
 
     @Test
     public void testToSnakeCase(){
-        String str = "myOrgName";
+        String camelCaseStr = "myOrgName";
         String snakeCaseStr = "my_org_name";
-        Assert.assertEquals(S.toSnakeCase(str), snakeCaseStr);
+        Assert.assertEquals(S.toSnakeCase(camelCaseStr), snakeCaseStr);
+        Assert.assertEquals(S.toSnakeCase(S.capFirst(camelCaseStr)), snakeCaseStr);
     }
 
     @Test
@@ -24,6 +25,7 @@ public class STest {
         String snakeCaseStr = "my_org_name";
         String camelCaseStr = "myOrgName";
         Assert.assertEquals(S.toLowerCaseCamel(snakeCaseStr), camelCaseStr);
+        Assert.assertEquals(S.toLowerCaseCamel(snakeCaseStr.toUpperCase()), camelCaseStr);
     }
 
     @Test
@@ -33,4 +35,4 @@ public class STest {
         Assert.assertEquals(S.uncapFirst("HelloWorld"), text);
     }
 
-}
+}
\ No newline at end of file