安史亂起，節度使大量的出現，論者或以為是為了平定叛亂而設置。但經由筆者長期的研究，首先由設置的時間點進行考察，即見此論點的錯誤。其次，由歸納得出的設置原則可見(一)以道為單元，進行區域內的分割設置。(二)新設節鎮以中小型為主。(三)經歷戰亂地區的節度使任命，具有道與道之間的排他性。藩鎮的佈署，最後形成肅宗整體的軍事戰略建構。也就是強幹弱枝的核心關中軍事防衛系統，及地方中小型節鎮彼此互相均衡牽制的藩鎮體制。本文以肅宗朝河東道節度使的設置為例，道內原有河東節度使以備禦突厥，安史亂起後則增設潞澤泌節度使及河中節度使。從設置的時間點進行考察，確與平亂無關，兩者皆為小型節鎮。河東節度使從李光弼出任節鎮後，此後到大曆十四年止，幾皆由河隴軍將出任。潞澤泌節度使從王思禮出任後，也全由河隴軍將出任。河中節度使則多任之以文人，其因此地曾淪陷叛軍，後由郭子儀所復，若不任以朔方軍將，則更難以它軍入節。本文另外考察了肅宗的節度使任命，明顯有壓抑朔方軍的現象，終造成僕固懷恩的叛亂。

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.