diff --git a/demo.py b/demo.py
new file mode 100644
index 0000000..2769b1f
--- /dev/null
+++ b/demo.py
@@ -0,0 +1,16 @@
+# coding=utf-8
+import os
+import judger
+
+
+base_path = os.path.dirname(os.path.abspath(__file__))
+
+
+print judger.run(path=os.path.join(base_path, "test"),
+                 in_file=os.path.join(base_path, "in"),
+                 out_file=os.path.join(base_path, "out"),
+                 max_cpu_time=2000,
+                 max_memory=200000000,
+                 args=["1", "2", "####"],
+                 env=["LD_PRELOAD=" + os.path.join(base_path, "sandbox.so")])
+