During the flight of high -speed aircraft, complex shock-shock interference phenomena occur, leading to a sharp increase in the heat flux in the wall area of the aircraft, which poses a huge challenge to the aircraft’s thermal protection system. To address the extreme aerodynamic heating problem caused by shock-shock interference, reverse jet is applied to the inlet lip of an X-51-like aircraft. A numerical simulation method is used to study the influence of the reverse jet at the inlet lip on the flow field structure and heat flux under the interference of the forebody shock. By changing the angle of attack of the incoming flow, the interference types of the forebody shock on the lip shock at different angles of attack and the influence laws on the lip flow field and heat flux distribution are obtained. Furthermore, the heat -reduction characteristics of reverse jets with different total pressure ratios under types III, IV, and V shock interferences are investigated.The results show that the change in the angle of attack will change the shock interference type at the lip. When the angle of attack changes from 3.8° to 4.0°, the interference type changes from type III to type IV. The reverse jet can convert type III shock interference into type-II-like and type IV shock interference into type-III-like, reducing the lip heat flux. For type V shock interference, the reverse jet will convert it into a more severe type-IV-like, resulting in an increase in the peak wall heat flux. The heat-reduction laws of the reverse jet at the inlet lip of the X-51-like aircraft at different angles of attack are obtained, and the action mechanism of the reverse jet under different shock interference types is clarified,which can provide support for the thermal protection design of the same type of aircraft.In addition, the research results show that the introduction of the reverse jet at the lip will reduce the total pressure loss of the inlet. Compared with the case without jet, the total pressure recovery coefficient is increased by 49%.At the same time, it increases the mass flow rate,which is beneficial to improving the performance of the inlet.