diff --git a/tools/pbtools/app.js b/tools/pbtools/app.js
index 18e157e4..81ef878c 100644
--- a/tools/pbtools/app.js
+++ b/tools/pbtools/app.js
@@ -14,7 +14,11 @@ class PBTools {
     this.protoDir = './proto/';
   }
 
-  async init() {
+  async loadCsPb() {
+    if (!fs.existsSync(this.protoDir + 'cs_proto.proto')) {
+      console.error('cs_proto.proto file not exists');
+      return;
+    }
     {
       this.csProtoPb = await (new protobuf.Root()).load(
         this.protoDir + 'cs_proto.proto',
@@ -33,6 +37,13 @@ class PBTools {
       this.csCmMsgId = this.csMsgIdPb.lookup('CMMessageId_e');
       this.csSmMsgId = this.csMsgIdPb.lookup('SMMessageId_e');
     }
+  }
+
+  async loadSsPb() {
+    if (!fs.existsSync(this.protoDir + 'ss_proto.proto')) {
+      console.error('ss_proto.proto file not exists');
+      return;
+    }
     {
       this.ssProtoPb = await (new protobuf.Root()).load(
         this.protoDir + 'ss_proto.proto',
@@ -50,6 +61,13 @@ class PBTools {
       );
       this.ssSSmMsgId = this.ssMsgIdPb.lookup('SSMMessageId_e');
     }
+  }
+
+  async loadMtPb() {
+    if (!fs.existsSync(this.protoDir + 'mt.proto')) {
+      console.error('mt.proto file not exists');
+      return;
+    }
     {
       this.mtPb = await (new protobuf.Root()).load(
         this.protoDir + 'mt.proto',
@@ -58,9 +76,18 @@ class PBTools {
         }
       );
     }
-    await this.genCsAutoGen();
-    await this.genMtbAutoGen();
-    await this.genSsAutoGen();
+  }
+
+  async init() {
+    if (this.csProtoPb) {
+      await this.genCsAutoGen();
+    }
+    if (this.ssProtoPb) {
+      await this.genMtbAutoGen();
+    }
+    if (this.mtPb) {
+      await this.genSsAutoGen();
+    }
   }
 
   async genCsAutoGen() {