diff --git a/basic-util/src/main/java/ink/wgink/util/string/WStringUtil.java b/basic-util/src/main/java/ink/wgink/util/string/WStringUtil.java
index cdf58917..a3ceed4a 100644
--- a/basic-util/src/main/java/ink/wgink/util/string/WStringUtil.java
+++ b/basic-util/src/main/java/ink/wgink/util/string/WStringUtil.java
@@ -120,7 +120,7 @@ public class WStringUtil {
      * @date 2018年2月28日 下午4:28:45
      */
     public static String lowerUpper2UnderLine(String str) {
-        return lowerUpper2Separator(str, "-");
+        return lowerUpper2Separator(str, "_");
     }
 
     /**