diff --git a/server/web3service/controllers/erc20.js b/server/web3service/controllers/erc20.js
index a7d1b22..4635a1d 100644
--- a/server/web3service/controllers/erc20.js
+++ b/server/web3service/controllers/erc20.js
@@ -2,12 +2,22 @@ const app = require('j7/app');
 const utils = require('j7/utils');
 const Web3 = require('web3');
 
+let erc20abi = null;
+
+async function getErc20Abil() {
+  if (erc20abi) {
+    const json = utils.readJsonFromFile(jsonUrl);
+    erc20abi = json.abi;
+  }
+  return erc20abi;
+}
+
 async function getBalance(session) {
   const tokenContractAddress = session.request('token_address'); // ERC20代币合约地址
   const accountAddress = session.request('account_address'); // 用户地址
   const rpcUrl = session.request('rpc_url');
 
-  const tokenContract = new web3.eth.Contract(ERC20_ABI, tokenContractAddress);
+  const tokenContract = new web3.eth.Contract(await getErc20Abil(), tokenContractAddress);
   const web3 = new Web3(rpcUrl);
 
   tokenContract.methods.balanceOf(accountAddress).call((error, balance) => {