The problem and solutions of high probability of trajectory early burst caused by tail bomb and proximity fuze matching were studied in this paper. On the basis of the analysis of the structure characteristics and working principle of fin stabilizer, and early explosion mechanism caused by the influence of unexpected signal on fuze in flight trajectory, controlled and improvable factors were found to propose the technical proposal that without changing the functional characteristics, fuze trajectory environment could be improved by improving the design of the interface relationship between individual parts, and the reliability growth was realized. The wind tunnel test results indicated that eliminating tail pin assembly clearance could effectively reduce the early burst probability in trajectory caused by fin vibration.