Abstract: A two-dimensional mixed-compression inlet model with slot-coupled cavity in 90° configuration at venter was investigated by wind tunnel at Mach number from 2.0 to 3.5.The range of the investigation covers angle of attack from-4° to 10° and angle of yaw from 0 to 4°.The performances,including critical pressure,total pressure recovery coefficient and mass flow ratio,were acquired.The results indicate that:with increase of the free stream Mach number or the angle of attack at Ma=3.0,the mass flow ratio increases firstly and then declines a little due to the increase of the total pressure loss around the body nose;and the maximum is obtained at design point.The flow field of two inlets is different at yaw,and the work range is determined by the windward inlet.Besides,the distribution of static-pressure coefficient along the duct validates that a terminal shock can stay around the cavity,so inlets with the slot-coupled cavity can work under wider back pressure.