diff --git a/hutool-core/src/main/java/org/dromara/hutool/core/text/NamingCase.java b/hutool-core/src/main/java/org/dromara/hutool/core/text/NamingCase.java
index 34c4ccb51..4144174e2 100644
--- a/hutool-core/src/main/java/org/dromara/hutool/core/text/NamingCase.java
+++ b/hutool-core/src/main/java/org/dromara/hutool/core/text/NamingCase.java
@@ -175,7 +175,12 @@ public class NamingCase {
 	}
 
 	/**
-	 * 将连接符方式命名的字符串转换为驼峰式。如果转换前的下划线大写方式命名的字符串为空，则返回空字符串。
+	 * 将连接符方式命名的字符串转换为驼峰式。如果转换前的下划线大写方式命名的字符串为空，则返回空字符串。<br>
+	 * 当otherCharToLower为{@code true}时，分为以下情况：
+	 * <ul>
+	 *     <li>如果给定字符串全部为大写，转换为小写，如NAME转为name。</li>
+	 *     <li>如果给定字符串大小写混合，认定为字符串已经是驼峰模式，只小写首字母，如TableName转换为tableName。</li>
+	 * </ul>
 	 *
 	 * @param name             转换前的自定义方式命名的字符串
 	 * @param symbol           原字符串中的连接符连接符
@@ -206,6 +211,13 @@ public class NamingCase {
 			}
 			return sb.toString();
 		} else {
+			if(otherCharToLower){
+				if(StrUtil.isUpperCase(name2)){
+					return name2.toLowerCase();
+				}
+				return StrUtil.lowerFirst(name2);
+			}
+
 			return name2;
 		}
 	}
diff --git a/hutool-core/src/test/java/org/dromara/hutool/core/map/Issue3340Test.java b/hutool-core/src/test/java/org/dromara/hutool/core/map/Issue3340Test.java
new file mode 100644
index 000000000..20c63ef5f
--- /dev/null
+++ b/hutool-core/src/test/java/org/dromara/hutool/core/map/Issue3340Test.java
@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2023. looly(loolly@aliyun.com)
+ * Hutool is licensed under Mulan PSL v2.
+ * You can use this software according to the terms and conditions of the Mulan PSL v2.
+ * You may obtain a copy of Mulan PSL v2 at:
+ *          https://license.coscl.org.cn/MulanPSL2
+ * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+ * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+ * See the Mulan PSL v2 for more details.
+ */
+
+package org.dromara.hutool.core.map;
+
+import org.dromara.hutool.core.text.StrUtil;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class Issue3340Test {
+	@Test
+	void toCamelCaseMapTest() {
+		final Map<String, Object> map = new HashMap<>();
+		map.put("ID","1");
+		map.put("NAME","2");
+		map.put("STU_ID","3");
+		final Map<String, Object> map1 = MapUtil.toCamelCaseMap(map);
+
+		Assertions.assertEquals("2", map1.get("name"));
+	}
+
+	@Test
+	void toCamelCaseTest() {
+		final String str = "ID";
+		Assertions.assertEquals("id", StrUtil.toCamelCase(str));
+	}
+}
diff --git a/hutool-core/src/test/java/org/dromara/hutool/core/text/NamingCaseTest.java b/hutool-core/src/test/java/org/dromara/hutool/core/text/NamingCaseTest.java
index 8178129a3..0192adb8e 100644
--- a/hutool-core/src/test/java/org/dromara/hutool/core/text/NamingCaseTest.java
+++ b/hutool-core/src/test/java/org/dromara/hutool/core/text/NamingCaseTest.java
@@ -22,7 +22,7 @@ public class NamingCaseTest {
 	public void toCamelCaseTest() {
 		Dict.of()
 				.set("Table_Test_Of_day","tableTestOfDay")
-				.set("TableTestOfDay","TableTestOfDay")
+				.set("TableTestOfDay","tableTestOfDay")
 				.set("abc_1d","abc1d")
 				.forEach((key, value) -> Assertions.assertEquals(value, NamingCase.toCamelCase(key)));
 	}