(This paper analyzes and compares various platform systems currently used in the mainstream market, and then studies and analyzes the architecture and component model of the Android platform system. Then it introduces the program framework of the Android system (with the lifecycle mechanism of Intent and Activity), and analyzes the first practical API. And I made a corresponding comment on how the Android system shows its strength among many operating system platforms by virtue of its own advantages. On the basis of the existing game engine LGame, realize the technical process and game composition of tower defense games based on Android platform. This game is simple to operate, durable, beautiful interface, excellent scalability and maintainability, and can run safely through testing.)