Abstract: According to fast in-situ detection requirement of TR module for phased array radar, this paper recommends a method which can quickly realize field in-situ detection equipment development. Through the analysis of working principle and input/output interfaces of detected objects, this paper gives out test requirement of detection equipment. It also elucidates system diagram and software flow chart by test function analysis, and introduces how to realize specialized detection equipment by utilizing open source module. The real detection verification shows that this equipment can meet in situ detection requirement of TR module, and has the advantages of portability, precise fault location and short development cycle.