Ping-pong is a very popular physical game all over the world. People need to play it in some fixed physical locations. Based on Augmented Reality (AR) technology, we provide a more interesting and convenient way for people to play ping-pong game on smartphones. In this paper, we propose an Augmented Reality 3D Ping-Pong game system (ARPP) for two players on Android platform through Wi-Fi Direct. The game is rendered when two players aim their phones' camera at a specific marker. The players can view the virtual table tennis scenario through the screen of their smartphones. They move their phones to control paddles to play ping-pong game. The experiment results show that the proposed game system can work effectively and provide winner results on two Android mobile devices.