diff --git a/src/org/nutz/dao/util/cri/SqlExpressionGroup.java b/src/org/nutz/dao/util/cri/SqlExpressionGroup.java
index 80fcc479e..d3bc4fa61 100644
--- a/src/org/nutz/dao/util/cri/SqlExpressionGroup.java
+++ b/src/org/nutz/dao/util/cri/SqlExpressionGroup.java
@@ -365,4 +365,12 @@ public List<SqlExpression> cloneExps() {
     public List<SqlExpression> getExps() {
 		return exps;
 	}
+    
+    public SqlExpressionGroup clone(){
+        SqlExpressionGroup seg = new SqlExpressionGroup();
+        seg.exps = cloneExps();
+        seg.pojo = this.pojo;
+        seg.top = this.top;
+        return seg;
+    }
 }