diff --git a/server/web3service/blockchain.js b/server/web3service/blockchain.js
index 5a85246..895781d 100644
--- a/server/web3service/blockchain.js
+++ b/server/web3service/blockchain.js
@@ -35,6 +35,13 @@ class BlockChain {
       this[`${data.name}Instance`] = await this.initInstance
       (this.getUserAddress(), data.address, this.netDir + data.json);
     }
+    const chainId = await this.web3.eth.getChainId();
+    if (chainId != this.netId) {
+      log.warning(util.format('net id error %s %s',
+                              chainId,
+                              this.netId
+                             ));
+    }
     event.emitEvent(C.BC_INITIALIZED_EVENT);
   }