Abstract: In order to reduce the risk of constructing a large-scale continuous wind tunnel, research on key technologies is carried out in the 0.6m wind tunnel of China Aerodynamics Research and Development Center, such as anti surge control and speed control of the compressor, Mach number control, and so on. Pressure fluctuation method is used to measure the surge margin of the compressor accurately, and the security of the compressor can be well ensured by setting a reasonable alarm line and surge line. Vector control technology is used to achieve the accurate control of speed, and the 0.03% control precision is achieved. The accurate control of Mach number is achieved by the function relationship between the compressor speed, chamber flow, the centrosome displacement and the Mach number, and the 0.002 control precision is achieved. Through the research of the key technologies, the operation mode of fixing stagnation pressure and Mach number is realized. Due to the excellent quality of flow fields achieved in the wind tunnel, it is a good platform to carry out basic and leading research on the construction of large continuous wind tunnels.