In order to study the effects of the depth of the deflector on the focusing process of the circularshaped cavity in the radial direction of the incident shock wave, experiments are carried out to investigate the radial incident shock focusing with Mach number 1.4 in cavity where the depths of deflectors are 0、5、10、15、17.5、20、25 mm respectively. With the schlieren photos of flow field in cavity captured by highspeed CCD camera, the dynamic pressure sensors is used to measure the pressure variation of the flow field during the focusing process, the behavior of radial incident shock wave reflect and focus in a circularshaped cavity is described. The shock wave focusing processes of different depth of the deflectors are compared. With the increase of the depth of deflectors, the outlet width of the cavity is reduced, and the discharge of the airflow is restricted, resulting in the enhancement of turbulence inside the cavity, due to the strong influence of turbulence, the internal shock wave structure is weakened, which has an impact on the high temperature and high pressure area caused by shock focusing, and is disadvantageous to shock detonation.