diff --git a/js/commonutil.js b/js/commonutil.js
index dc12c64..0dee959 100644
--- a/js/commonutil.js
+++ b/js/commonutil.js
@@ -49,9 +49,15 @@ var initVue = function () {
                         newKey.id = this.sm2KeyList.length;
                         newKey.title = headerVue.shortName;
                         newKey.sm2Key = this.sm2KeyStr;
-                        this.sm2KeyList.push(newKey);
+                        var exist = false;
+                        for (var i=0;i<this.sm2KeyList.length;i++){
+                            var iterKey = this.sm2KeyList[i];
+                            if (iterKey.sm2Key==newKey.sm2Key)
+                                exist = true;
+                        }
+                        if (!exist)
+                            this.sm2KeyList.push(newKey);
                         localStorage.setItem("PrivKeyList", JSON.stringify(this.sm2KeyList));
-
                         getSession();
                         listProjects("priv");
                     }