diff --git a/src/main/java/io/mycat/server/handler/ServerPrepareHandler.java b/src/main/java/io/mycat/server/handler/ServerPrepareHandler.java
index e12ad5563..c53c26abe 100644
--- a/src/main/java/io/mycat/server/handler/ServerPrepareHandler.java
+++ b/src/main/java/io/mycat/server/handler/ServerPrepareHandler.java
@@ -26,6 +26,7 @@
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.UnsupportedEncodingException;
+import java.nio.CharBuffer;
 import java.util.Map;
 import java.util.Objects;
 import java.util.concurrent.ConcurrentHashMap;
@@ -281,6 +282,12 @@ public boolean visit(SQLVariantRefExpr x) {
                                 parent.replace(x, new SQLCharExpr(value));
                                 return false;
                             }
+                            if (bindValue.value instanceof CharBuffer) {
+                                SQLReplaceable parent = (SQLReplaceable) x.getParent();
+                                String value = bindValue.value.toString();
+                                parent.replace(x, new SQLCharExpr(value));
+                                return false;
+                            }
                             throw new UnsupportedOperationException("unsupport " + bindValue.value);
                     }