diff --git a/server/web3bcspider/services/erc721_refresher.js b/server/web3bcspider/services/erc721_refresher.js
index a6946aa..00313e9 100644
--- a/server/web3bcspider/services/erc721_refresher.js
+++ b/server/web3bcspider/services/erc721_refresher.js
@@ -15,6 +15,7 @@ class Erc721Refresher extends BaseService {
     this.bc = bc;
     this.net = net;
     this.refresher = refresher;
+    this.lastIdx = BigInt(0);
     this.conf = this.refresher['conf'];
     this.progInfo = this.refresher['progressInfo'];
     await this.start();
@@ -31,7 +32,7 @@ class Erc721Refresher extends BaseService {
     const logHead = this.genLogHead('pullEvent ');
     try {
       const {err, rows} = await this.conn.execQuery(
-        'SELECT * FROM t_erc721_refresh WHERE ' +
+        'SELECT * FROM t_erc721_refresh WHERE idx > ' + this.lastIdx.toString() + ' ' +
           'AND net_id = ? AND contract_address = ? AND status = 0 ' +
           'LIMIT ' + LIMIT_COUNT,
         [
@@ -48,6 +49,8 @@ class Erc721Refresher extends BaseService {
             await this.refresh(row);
           }
         );
+      } else {
+        this.lastIdx = BigInt(0);
       }
     } catch (err) {
         log.error(logHead + err);