Mobile Functional Test on TaaS Environment With the rapid development of the mobile internet, a large number of mobile apps are developed and need to be tested adequately. This paper proposes a functional test method based on Testing-as-a-Service (TaaS) platform. TaaS platform provides an integrated test environment for android apps. The mobile TaaS could generate the test script based on functional traversal for the app automatically, then execute the test on diverse devices and discover the test errors. Furthermore, the paper evaluates the app functional traversal method and shows the prototype of the mobile TaaS platform. Finally, the paper summarizes the advantage, limitations and future work of our mobile TaaS platform.