diff --git a/server/web3helper/blockchain.js b/server/web3helper/blockchain.js
index 2003e23..bb6c491 100644
--- a/server/web3helper/blockchain.js
+++ b/server/web3helper/blockchain.js
@@ -14,6 +14,7 @@ class BlockChain {
     this.currBlockNumber = 0;
     this.refreshCond = new sync.Cond();
     this.lastRefreshTime = utils.getUtcTime();
+    this.firstBlockNumber = -1;
     this.netId = 0;
     setTimeout(this.refreshBlockNumber.bind(this), 1000 * 0.01);
   }
@@ -73,6 +74,33 @@ class BlockChain {
     return this.currBlockNumber;
   }
 
+  async getFirstBlockNumber() {
+    while (this.firstBlockNumber < 0) {
+      const {err, conn} = await app.getDbConn('MarketDb0');
+      if (err) {
+        await utils.sleep(1000 + utils.randRange(500, 1500));
+        continue;
+      }
+      try {
+        const {err, row} = await conn.ormSelectOne(
+          't_parameter',
+          [
+            ['name', 'first_block_number']
+          ]
+        );
+        if (!err && row) {
+          this.firstBlockNumber = Number(row['value']);
+        }
+      } catch (e) {
+
+      } finally {
+        conn.release();
+      }
+      await utils.sleep(5000 + utils.randRange(500, 1500));
+    }
+    return this.firstBlockNumber;
+  }
+
 }
 
 module.exports = new BlockChain();