In order to reduce the landing gear aerodynamic noise, a new method based on edge jet is proposed, which is used to analyze the active control technology of landing gear, and the validity of the method is verified by numerical calculation. Taking a certain type of aircraft landing gear as the research object, the flow field around the structure of the model is calculated by using Detached Eddy Simulation, and the sound source distribution is obtained. The far field noise characteristic is obtained by using FW-H integral. The results show that the edge jet can effectively suppress the interference and pillar noise, and the middle band noise of the landing gear can be reduced, and the broadband noise intensity is weakened. Through the analysis of the flow field and sound field, the mechanism of the noise reduction is explained: the flow of the jet is changed to reduce or even eliminate the impact of vortex shedding on the pillars.