Aiming at the problem that the structural damage of the supersonic inlet will affect the internal and external flow field and performance parameters, the influence of two damage types of throat perforation and cone fracture on the supersonic inlet is analyzed by numerical simulation. The working conditions of the three models at 0° and 4° angles of attack are calculated respectively. The two kinds of damage will increase the resistance coefficient. At 0° angle of attack, the throat damage greatly influences the flow field, and the cone fracture damage has little effect. At 4 ° angle of attack, the flow field changes little after damage. However, the distributions of the internal Mach number, pressure and total pressure recovery coefficient of the two damaged models are different from those of the undamaged model. The pressure distribution along the symmetry plane of the cone fracture damage model is similar to that of the non-destructive model, while the throat perforation damage is quite different from the non-destructive model. The calculation results can provide some reference for the judgment of performance degradation after missile damage.