Air Combat Maneuvering Instrumentation (ACMI) is an auxiliary equipment for training and assessment of the pilots skills of platform controlling,weapon operating,and tactics applying.The typical architectures and functions of ACMI are introduced taking P4,P5 and P5IS as examples.Analysis is made to the key technologies,including wireless communication network technology,accurate time/space positioning technology,weapon modeling and simulation technology,real-time attack effect notification technology,and ground display and replay technology.Finally,the developing trends of embedded equipment and live-virtual integration are pointed out.