A large number of Chieh-tu Shih emergence during An-Shih Rebellion, many commentators thought it was set up to suppress the rebellion. However, through my long-term studies, first, it was wrong by setting time. Second, I conclude three viewpoints to support it. (a) The religons, named Dou, were divided into several areas. (b) These areas were middle and samll-sized Chieh-tu Shih. (c) This kind of Chieh-tu Shih was exclusive between each other. The strategy that T’ang Su-tsung set up lots of Chieh-tu Shih could not only fortify central power but also weaken the Chieh-tu Shih. The strategy made the Chieh-tu Shih, which had less power, form a well defensive system, and be well-matched in forces.This paper discuss the principles and purposes of setting up Hotung-Dou Chieh-tu Shih during An-Shih Rebellion in T’ang Su-tsung dynasty.