A numerical simulation was conducted for a fixed-geometry two-dimensional mixed-compression supersonic inlet with sweepforward high-light and "X"-type missile configuration.The results indicate:(1) The total pressure recovery declines with the rise of the free stream Mach number

while the mass flow ratio rises firstly and then declines when its maximum value is obtained at the design point.(2)When the angle of attack increases less than 6°

the total pressure recovery of both side inlets decreases in a narrow range;the mass flow ratio of the lee side inlet is higher than that of the windward inlet

the total flow mass of both sides is almost constant.(3) When the angle of attack increases from 6° to 9°

both the total pressure recovery and the mass flow ratio fall rapidly at the lee side inlet

whereas the total pressure recovery declines and mass flow ratio rises at the windward side inlet.(4)The numerical simulation results show a consistent trend with the experimental results.