The design of thrust reverser on the engine nacelle system is an important means for civil aircraft to reduce the landing distance and lighten the load on the landing gear braking system. For the engine whose main body is not easy to change, the bucket type thrust reverser has the advantages of simple principle, convenient implementation, etc. , and is a better design option. The bucket angle is an important parameter in the design of this kind of thrust reverser, which has greater impact on the thrust reverser performance. In order to comprehensively study the influence of different bucket angle on thrust reverser performance, a preliminary scheme of bucket type thrust reverser was designed based on a certain turbofan engine, and the flow field distribution of the thrust reverser during its operation was numerically simulated. The change of thrust reverser and thrust reverser efficiency was emphatically analyzed. The results show that, within the angle range studied, with the bucket angle increasing gradually, the reverse thrust and reverse thrust effect increase first and then decrease. When the bucket angle is 110°, the reverse thrust efficiency is the highest. However, at a low speed close to the shutdown state, when the bucket angle is small, a large amount of reverse exhaust flow will be drawn into the inlet, thus affecting the normal operation of the engine. By comparing the calculation results of different schemes, the recommended design value of bucket angle is given, which can provide reference for the detailed design of reverse thrust device and subsequent engineering application.