diff --git a/server/wheelserver/mt/export.go b/server/wheelserver/mt/export.go
index 65026bc6..fd31f96d 100644
--- a/server/wheelserver/mt/export.go
+++ b/server/wheelserver/mt/export.go
@@ -18,7 +18,7 @@ var Table = f5.New(func(this *table) {
 
 	this.Web3ServiceCluster = f5.New(func(this *Web3ServiceClusterTable) {
 		this.FileName = "../config/web3service.cluster.json"
-		this.PrimKey = "instance_id"
+		this.PrimKey = ""
 	})
 
 	this.Config = f5.New(func(this *ConfigTable) {