diff --git a/scripts/construct/build_pb.py b/scripts/construct/build_pb.py
index a85ef1b..0fcb4d9 100644
--- a/scripts/construct/build_pb.py
+++ b/scripts/construct/build_pb.py
@@ -40,16 +40,19 @@ def need_rebuild(pb_files):
             return True
     return False
 
-def rebuild(cpp_out, python_out, pb_files):
+def rebuild(cpp_out, python_out, java_out, pb_files):
     def genParams():
         cpp_param = ''
         py_param = ''
+        java_param = ''
         for pb_file in pb_files:
             if cpp_out != '':
                 cpp_param += 'protoc --proto_path=../tools/protobuild --cpp_out=%s ../tools/protobuild/%s.proto && ' % (cpp_out, pb_file)
             if python_out != '':
                 py_param += '../../third_party/tools/bin/protoc --proto_path=../tools/protobuild --python_out=%s ../tools/protobuild/%s.proto && ' % (python_out, pb_file)
-        return cpp_param + py_param + ' echo ""'
+            if java_out != '':
+                py_param += '../../third_party/tools/bin/protoc --proto_path=../tools/protobuild --java_out=%s ../tools/protobuild/%s.proto && ' % (java_out, pb_file)
+        return cpp_param + py_param + java_param + ' echo ""'
     global g_is_terminated
     try:
 #        print(genParams())
@@ -95,6 +98,13 @@ parser.add_option(
     default = '',
     help = "",
 )
+parser.add_option(
+    "",
+    "--java_out",
+    dest = "java_out",
+    default = '',
+    help = "",
+)
 parser.add_option(
     "",
     "--pb_files",
@@ -106,6 +116,6 @@ if not options.nohooks:
     repair_githooks()
 
 if need_rebuild(options.pb_files.split(',')):
-    rebuild(options.cpp_out, options.python_out, options.pb_files.split(','))
+    rebuild(options.cpp_out, options.python_out, options.java_out, options.pb_files.split(','))
 else:
     print('pb files already is the latest')