Abstract: With the increasing of the automation control requirements, more and more miniature stepper motors are used in the modern vehicle to drive some components, such as skylights, windows and so on. Stepper motors of vehicles have strict requirements for phase current , phase resistance and out of step under load. This paper constructs a test system of stepper motor integrated performance by the design of hardware and software code. The test via running shows that the designed system has stable performance and simple structure, and can accurately reflect the overall performance of the motor. Meanwhile, it can meet the requirement of factory on testing stepper motors automation. The designed system uses magnetic brakes and torque sensors to simulate the load and the load detection. Hence, this method can be applied to other detection systems with load, and has better application prospect.