With the development of modern combat aircraft, more external hanging are put inside and more types of external hanging are mounted, which requires higher technology for the wind tunnel jettison test. According to the new requirements, the control and measuring system of jettison test in low speed wind tunnel is developed. Establish 4-loop jettison and boosting control loop, and use modern test technology and synchronization high-speed camera measurement. The results show that the system can realize precise control and trajectory analysis for the single, simultaneous and continuous jettison of the four-loop external stores, and it is feasible to carry out the jettison test in wind tunnel.