diff --git a/server/common/bchelper.js b/server/common/bchelper.js
index e2d6f77..13e7713 100644
--- a/server/common/bchelper.js
+++ b/server/common/bchelper.js
@@ -1,27 +1,44 @@
 const constant = require("common/constant");
+const bcconst = require("common/bcconst");
 
-function getNftNameByTokenType(tokenType) {
-  switch (Number(tokenType)) {
-  case bcconst.BC_NFT_HERO:
+function getItemMetaNftType(itemMeta) {
+  switch (Number(itemMeta['type'])) {
+  case constant.ITEM_HERO_TYPE:
     {
-      return HERO_INSTANCE_NAME;
+      return bcconst.BC_NFT_HERO;
     }
     break;
-  case bcconst.BC_NFT_CHIP:
+  case constant.ITEM_GUN_TYPE:
     {
-      return CHIP_INSTANCE_NAME;
+      return bcconst.BC_NFT_EQUIP;
     }
     break;
-  case bcconst.BC_NFT_CLAIM_BOX:
+  case constant.ITEM_MATERIAL_TYPE:
     {
-      return Gacha_INSTANCE_NAME;
+      if (itemMeta['sub_type'] == constant.ITEM_MATERIAL_CHIP_SUBTYPE_SUBTYPE) {
+        return bcconst.BC_NFT_CHIP;
+      } else {
+        return bcconst.BC_NFT_NONE;
+      }
+    }
+    break;
+  case constant.ITEM_CHIP_TYPE:
+    {
+      return bcconst.BC_NFT_CHIP;
+    }
+    break;
+  case constant.ITEM_BLIND_BOX_TYPE:
+    {
+      return bcconst.BC_NFT_BLIND_BOX;
     }
     break;
   default:
     {
-      return '';
+      return bcconst.BC_NFT_NONE;
     }
+    break;
   }
+  return bcconst.BC_NFT_NONE;
 }
 
-exports.getNftNameByTokenType = getNftNameByTokenType;
+exports.getItemMetaNftType = getItemMetaNftType;
diff --git a/server/web3sign/metadata/Item.js b/server/web3sign/metadata/Item.js
index f047bd6..376d474 100644
--- a/server/web3sign/metadata/Item.js
+++ b/server/web3sign/metadata/Item.js
@@ -1,49 +1,14 @@
 const assert = require('assert');
 const utils = require('j7/utils');
 const bcutils = require('j7/bcutils');
+const bchelper = require('common/bchelerp');
 const basewrap = require('./basewrap');
 const factory = require('./factory');
 
 class Item extends basewrap.BaseWrap {
 
   getNftType() {
-    switch (this['type']) {
-    case HERO_TYPE:
-      {
-        return bcutils.HERO_TYPE;
-      }
-      break;
-    case GUN_TYPE:
-      {
-        return bcutils.EQUIP_TYPE;
-      }
-      break;
-    case MATERIAL_TYPE:
-      {
-        if (this['sub_type'] == MATERIAL_CHIP_SUBTYPE) {
-          return bcutils.CHIP_TYPE;
-        } else {
-          return bcutils.NONE_TYPE;
-        }
-      }
-      break;
-    case CHIP_TYPE:
-      {
-          return bcutils.CHIP_TYPE;
-      }
-      break;
-    case BLIND_BOX_TYPE:
-      {
-        return bcutils.BLIND_BOX_TYPE;
-      }
-      break;
-    default:
-      {
-        return bcutils.NONE_TYPE;
-      }
-      break;
-    }
-    return bcutils.NONE_TYPE;
+    return bchelper.getItemMetaNftType(this);
   }
 
 }