Spin tunnel is a specific facility to investigate aircraft spin and spin recovery. Since the size of aircraft spin model is limited by cross section of test section and flow field boundary condition, it is difficult to set the measurement system inside model. In earlier time, the attitude of spin model was captured and identified by the external system to analyze further aircraft spin characteristics and recovery characteristics. With the development of materials science, intelligent processing technology and signal transmission technology, measurement system is modularized, miniaturized and ultra microminiaturized, and it can be set inside the aircraft spin model. Thus, data can be taken during the tests, interpretation and identification can be carried out simultaneously, furthermore, the measured data is more complete.