Abstract: In order to improve the stability and reliability of SAC electro-hydraulic control system controller application software, the problems existing in software development unit testing are put forward, such as single software testing method, simple testing environment, low coverage rate of software development test, and can not effectively reproduce the field problems. To solve these problems, the SAC type electro-hydraulic control system is used to improve the software quality. Establish an automated test platform, describe the hardware design and software design of the test platform, collect the controller status through the data acquisition device, use the IMX6 automatic test device to carry out automatic software function test, realize the application software valve output, sensor signal simulation, real-time data acquisition and display test. Four effective automated testing methods based on function driven, data driven, boundary information and field problems are proposed, which can realize the basic function, advanced function and safety function testing of the application software, and combine the test cases and field feedback problems, reproduce the problems and find out the reasons, so as to ensure the robustness of the software and provide a theoretical basis for further realizing the automatic testing of the application software.