diff --git a/README.md b/README.md
index aa4bc81..d10762d 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,29 @@
-# class_16
+# PythonPlantsVsZombies
+  A simple PlantsVsZombies game. <br>
+  `It's only for personal learning and noncommercial use. If this game infringes the copyright, please let me know.`
+* implement plants: sunflower, peashooter, wallnut, snowpeashooter, cherrybomb, threepeashooter, chomper, puffshroom, potatomine, spikeweed, scaredyshroom, squash, scaredyshroom, jalapeno, sunShroom, iceShroom, hypnoShroom.
+* implement zombies: zombie, flagzombie, coneheadzombie, bucketheadzombie, newspaperzombie.
+* use json file to store level data (e.g.position and time of zombies, background info)
+* support to select plant cards at the beginning of the level
+* support day level, night level, moving card select level and wallnut bowling level
+
+# Requirement
+* Python 3.7 
+* Notice: python version 3.7 is advisable, but not required. For LINUX: if your Linux system has a preinstalled python 3+, it's ok to run this game. Updating to python 3.7 directly may break LINUX Mint.
+* Python-Pygame 1.9
+
+# How To Start Game
+$ python main.py
+
+# How to Play
+* use mouse to collect sun, select the plant cards and seed the plant 
+* you can set the start level by changing START_LEVEL_NUM value in source/constants.py
+  * level 1 and 2：day level
+  * level 3: night level
+  * level 4: moving card select level
+  * level 5: wallnut bowling level
+
+# Demo
+![demo1](https://raw.githubusercontent.com/marblexu/PythonPlantsVsZombies/master/demo/demo1.jpg)
+![demo2](https://raw.githubusercontent.com/marblexu/PythonPlantsVsZombies/master/demo/demo2.jpg)