diff --git a/src/org/redkale/util/Utility.java b/src/org/redkale/util/Utility.java
index 549a9477e..405cbe9de 100644
--- a/src/org/redkale/util/Utility.java
+++ b/src/org/redkale/util/Utility.java
@@ -1924,7 +1924,15 @@ public final class Utility {
         final int limit = start + len;
         for (int i = start; i < limit; i++) {
             c = chars[i];
-            size += (c < 0x80 ? 1 : (c < 0x800 ? 2 : 3));
+            if (c < 0x80) {
+                size++;
+            } else if (c < 0x800) {
+                size += 2;
+            } else if (Character.isSurrogate(c)) {
+                size += 2;
+            } else {
+                size += 3;
+            }
         }
         return size;
     }