diff --git a/server/web3bcspider/blockchain.js b/server/web3bcspider/blockchain.js
index b1640a7..ca6ba05 100644
--- a/server/web3bcspider/blockchain.js
+++ b/server/web3bcspider/blockchain.js
@@ -13,6 +13,12 @@ class BlockChain {
 
   constructor(netId) {
     this.netId = netId;
+    this.lastQueryTime = utils.getUtcTime();
+    this.queryLockTimes = 0;
+    this.currBlockNumber = 0;
+    this.refreshCond = new sync.Cond();
+    this.lastRefreshTime = utils.getUtcTime();
+    setTimeout(this.refreshBlockNumber.bind(this), 1000 * 0.01);
   }
 
   async initInstance(user, address, jsonUrl) {
@@ -75,6 +81,46 @@ class BlockChain {
     return contract;
   }
 
+  async lockQuery() {
+    while (this.queryLockTimes > 3) {
+      await utils.sleep(100 + utils.randRange(10, 100));
+    }
+    ++this.queryLockTimes;
+    this.lastQueryTime = utils.getUtcTime();
+  }
+
+  async unlockQuery() {
+    await utils.sleep(10 + utils.randRange(10, 50));
+    --this.queryLockTimes;
+  }
+
+  isAddress(address) {
+    return this.web3.utils.isAddress(address);
+  }
+
+  async refreshBlockNumber() {
+    const logHead = 'refreshBlockNumber';
+    while (true) {
+      try {
+        this.currBlockNumber = await this.web3.eth.getBlockNumber();
+        this.actived = true;
+        this.lastRefreshTime = utils.getUtcTime();
+        console.log('currBlockNumber', this.currBlockNumber);
+        if (!this.initedBlockNumber) {
+          this.initedBlockNumber = true;
+          this.initBlockNumber = this.currBlockNumber;
+        }
+      } catch (e) {
+        this.actived = false;
+        log.warning(util.format('%s err:%s',
+                                logHead,
+                                e
+                               ));
+      }
+      await this.refreshCond.wait(1000 * 3);
+    }
+  }
+
 }
 
 module.exports = BlockChain;