In order to study the influence of the mutual interference between the gas jet and rudder surface on the aerodynamic characteristics of a flying vehicle， based on the computational model of a ruddered spinning body vehicle， the influence of the composite aerodynamic characteristics of the gas jet and rudder surface of a flying vehicle under different conditions is analyzed by solving the Reynolds-averaged N-S equations. The simulation results show that： in the spatial flow field， the influence of the rudder deflection angle change on the flow field structure is mainly concentrated in the flow field structure of the jet wake， while in the object surface flow field， it is mainly concentrated in the separation line and the reattachment node； with the upward deflection of the rudder blade， the jet control efficiency shows a tendency of increasing and then decreasing， and the jet control efficiency is obviously lower than that of the two directions when they are in opposite directions when the direction of the direct lateral force is the same as that of the aerodynamic control force；The lower the flight altitude and the higher the Mach number， the more efficient the jet control.