In order to meet the demands of torsional vibration damper characteristics test, a design scheme of test system, which is a computer controlled, using servo control principle, is proposed in this paper. The system operation and main functions are given. Hardware and software structures are described. The stability and reliability of the system are ensured by the using of servo control technology. Computer’s great processing power ensures the efficiency and accuracy of the test system, the modular structure of the software enriches the functionality of the system.