This paper presents the automatic test system consisting of PC industry computer andintelligent measuring instrument. Using the method of time-measuring in fixed angle, high accuracyoptical prizm and laser angle-measuring technique,the test of high accuracy,low-rate sudden-stop turntable has been realized. The paper describes the construction of the system,verification principle of theturn rate,software design and method of data processing. Finally,the result of the practical applicationis shown.