diff --git a/plusone-validator/src/main/java/xyz/zhouxy/plusone/validator/StringPropertyValidator.java b/plusone-validator/src/main/java/xyz/zhouxy/plusone/validator/StringPropertyValidator.java
index e97d5a5..a70550e 100644
--- a/plusone-validator/src/main/java/xyz/zhouxy/plusone/validator/StringPropertyValidator.java
+++ b/plusone-validator/src/main/java/xyz/zhouxy/plusone/validator/StringPropertyValidator.java
@@ -275,7 +275,7 @@ public class StringPropertyValidator<DTO> extends BaseComparablePropertyValidato
             return false;
         }
         final int len = str.length();
-        return len >= min && len < max;
+        return len >= min && len <= max;
     }
 
     public StringPropertyValidator<DTO> length(int min, int max, String errMsg) {