A test system based on programmable logic controller (PLC) was designed to provide engineering and technical personnel with easy to handle characteristics testing equipment of ultrasonic motor. The pulse signal of the torque sensor was output to the highspeed input port of the PLC. According to the testing requirements of ultrasonic motor, the torque and rotation speed were tested and displayed by using the ladder diagram, through the pulse input of torque sensor. Through the manmachine interface of programmable logic controller, the touch screen controls the testing of the ultrasonic motor. The testing system could complete four kinds of modes, such as the mechanical characteristic test of ultrasonic motor, automatic loading and unloading test, ultrasonic motor starting characteristic test with load and ultrasonic motor manual test. The system was verified by experiments. The system was easy to operate.