diff --git a/server/web3sign/controllers/erc.js b/server/web3sign/controllers/erc.js
index d2a7ab3..132778d 100644
--- a/server/web3sign/controllers/erc.js
+++ b/server/web3sign/controllers/erc.js
@@ -11,6 +11,7 @@ async function approveErc20(session) {
     const netId = session.request('net_id');
     const spender = bcutils.toNormalAddress(session.request('spender'));
     const value = session.request('value');
+    const currencyName = session.request('currency_name');
     const bc = serviceFactory.create('BlockChain');
     {
       const ret = await bc.init(netId);
@@ -31,6 +32,24 @@ async function approveErc20(session) {
         return;
       }
     }
+
+    const instance = bc.getInstanceByName(currencyName);
+    if (!instance) {
+        session.rspErr(500, 'currency error');
+        return;
+    }
+    let data = instance.methods.approve
+    (
+      spender,
+      value).encodeABI();
+
+    session.rspData({
+      'trans_id' : '',
+      'trans_req': {
+        'to': '',
+        'data': data
+      }
+    });
   } catch (e) {
     session.rspErr(1, 1);
     utils.safeDumpErrStack(e);
diff --git a/server/web3sign/controllers/factory.js b/server/web3sign/controllers/factory.js
index df3f67a..5d88699 100644
--- a/server/web3sign/controllers/factory.js
+++ b/server/web3sign/controllers/factory.js
@@ -9,7 +9,7 @@ async function init() {
   add('activate721nft');
   add('nftunlock');
   add('minthero');
-  add('erc20');
+  add('erc');
 }
 
 exports.init = init;