In order to obtain the influence law of different structural parameters on the performance of the scarfed nozzle, performance of the scarfed nozzle with different structural parameters was obtained by numerical simulations and compared. The results show that for motor using a single-stage scarfed nozzle, the motor thrust increases with the increase of the divergent half-angle of the nozzle, and decreases with the increase of the scarfed angle and the shaft angle between nozzle and motor axis. For the motor using a two-stage scarfed nozzle, the outlet half-angle of divergent section increases, the engine thrust firstly increases and then remains basically unchanged. In the design of two-stage scarfed nozzle, the larger outlet half-angle of divergent section is beneficial to obtain a larger motor thrust, but it will lead to a smaller inlet half-angle of divergent section which will aggravate ablation.