A software system for test and exercise is developed based on Android mobile phone. The system consists of a client-end application running on Android mobile phone and a set of server-end service applications. The system components include database server, WEB server, wireless network and Android front-end. The client Android system of intelligent mobile phone with front-end processing and calculating ability can access the server through the network to the server, upload the test results or download new test papers. The content of this paper covers the overall system structure design and application, gives some design code. Practice shows that the system realizes the whenever and wherever learning, which wins a good reputation among users, and achieves the expected goal.