Abstract: At different attack angles,Mach numbers and ramp angles,the numerical calculations of inner and external flow field are performed for an adjustable mixed compression inlet.The full flow field characteristics of a supersonic inlet are illustrated at design conditions;The influence of attack angle on flow field of the inlet is investigated;B-spline theory is used to model the inlet with attack angle.On basis of the modeling results,the effects of Mach number,attack angle and ramp angle on the inlet performance are analyzed.