diff --git a/server/web3dbspider/services/events/common/BaseEventProcess.js b/server/web3dbspider/services/events/common/BaseEventProcess.js
index 703d92e..cfe752e 100644
--- a/server/web3dbspider/services/events/common/BaseEventProcess.js
+++ b/server/web3dbspider/services/events/common/BaseEventProcess.js
@@ -21,9 +21,20 @@ class BaseEventProcess {
 
   async safeRelease() {
     try {
-
+      if (this.bcEventConn) {
+        this.bcEventConn.release();
+        this.bcEventConn = null;
+      }
+      if (this.bcNftConn) {
+        this.bcNftConn.release();
+        this.bcNftConn = null;
+      }
+      if (this.gameConn) {
+        this.gameConn.release();
+        this.gameConn = null;
+      }
     } catch (err) {
-
+      utils.safeDumpErrStack(err);
     }
   }
 
@@ -72,7 +83,8 @@ class BaseEventProcess {
   async updateEventDb(fields) {
     const logHead = this.genLogHead('updateEventDb');
     while (true) {
-      const {err} = await this.conn.update(
+      const {err} = await this.bcEventConn(
+        'update',
         this.eventProc.getTableName(),
         [
           ['idx', this.getEventDb['idx']],
@@ -109,8 +121,8 @@ class BaseEventProcess {
   async add721NftRefresh(netId, contractAddress, contractName, tokenId) {
     while (true) {
       const nowTime = utils.getUtcTime();
-      const {err} = await this.conn.upsert
-      (
+      const {err} = await this.bcEventConn(
+        'upsert',
         't_erc721_refresh',
         [
           ['net_id', netId],
@@ -142,20 +154,53 @@ class BaseEventProcess {
   }
 
   async bcEventDbConn(method, ...args) {
-    const conn = await this.getMarketDb();
+    if (!this.bcEventConn) {
+      const {err, conn} = await app.getDbConn(constant.BCEVENTDB_NAME);
+      if (err) {
+        return {
+          'err': err,
+          'row': null,
+          'rows': null
+        };
+      }
+      this.bcEventConn = conn;
+    }
+    return await this.internalDbConn(this.bcEventConn, method, ...args);
+  }
+
+  async bcNftDbConn(method, ...args) {
+    if (!this.bcNftConn) {
+      const {err, conn} = await app.getDbConn(constant.BCNFTDB_NAME);
+      if (err) {
+        return {
+          'err': err,
+          'row': null,
+          'rows': null
+        };
+      }
+      this.bcNftConn = conn;
+    }
+    return await this.internalDbConn(this.bcNftConn, method, ...args);
+  }
+
+  async gameDbConn(method, ...args) {
+    if (!this.gameConn) {
+      const {err, conn} = await app.getDbConn(constant.BCNFTDB_NAME);
+      if (err) {
+        return {
+          'err': err,
+          'row': null,
+          'rows': null
+        };
+      }
+      this.gameConn = conn;
+    }
+    return await this.internalDbConn(this.gameConn, method, ...args);
+  }
+
+  async internalDbConn(conn, method, ...args) {
     const ret = await conn[method](...args);
-    if (ret.err){
-      this.throwError(500, 'internal error');
-      log.error(ret.err);
-      return;
-    }
-    if (utils.hasKey(ret, 'row')) {
-      return ret['row'];
-    } else if (utils.hasKey(ret, 'rows')) {
-      return ret['rows'];
-    } else {
-      return null;
-    }
+    return ret;
   }
 
 }