diff --git a/judge/dispatcher.py b/judge/dispatcher.py
index 1b7b6e5..8589425 100644
--- a/judge/dispatcher.py
+++ b/judge/dispatcher.py
@@ -117,7 +117,7 @@ class JudgeDispatcher(DispatcherBase):
                 return
             self.submission.statistic_info["score"] = score
 
-    def judge(self, output=True):
+    def judge(self):
         server = self.choose_judge_server()
         if not server:
             data = {"submission_id": self.submission.id, "problem_id": self.problem.id}
@@ -145,7 +145,7 @@ class JudgeDispatcher(DispatcherBase):
             "max_cpu_time": self.problem.time_limit,
             "max_memory": 1024 * 1024 * self.problem.memory_limit,
             "test_case_id": self.problem.test_case_id,
-            "output": output,
+            "output": False,
             "spj_version": self.problem.spj_version,
             "spj_config": spj_config.get("config"),
             "spj_compile_config": spj_config.get("compile"),
diff --git a/submission/migrations/0009_delete_user_output.py b/submission/migrations/0009_delete_user_output.py
new file mode 100644
index 0000000..66c90c4
--- /dev/null
+++ b/submission/migrations/0009_delete_user_output.py
@@ -0,0 +1,24 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations
+
+
+def delete_user_output(apps, schema_editor):
+    Submission = apps.get_model("submission", "Submission")
+    for item in Submission.objects.all():
+        if "data" in item.info and isinstance(item.info["data"], list):
+            for index in range(len(item.info["data"])):
+                item.info["data"][index]["output"] = ""
+            item.save()
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('submission', '0008_submission_ip'),
+    ]
+
+    operations = [
+        migrations.RunPython(delete_user_output, reverse_code=migrations.RunPython.noop)
+    ]