This is a perfect testing instrument which is suitable for project quality testing section, universities and colleges, research institution and industrial and mining enterprise.The loading system of this machine, controlled by computer, rotates load through alternating servo motor and cyclical gear reducer. Torque and twist angle detection uses the high-precision torque sensor and a photoelectric encoder; computer displays dynamically the curve of test torsion angle and torque, rate of loading, peak of power and so on.