The invention discloses a unidirection control combined power adjustable air inlet way and a design method thereof. The air inlet way is composed of a first-stage bending compression face, a second-stage bending compression face, a fixing lip cover, a throat equal straight section and a square-to-round expansion section. The unidirection control combined power adjustable air inlet way is characterized in that a hook face+wedge face combined external pressure section wave system combinatorial arrangement is provided and is applied to a binary supersonic velocity air inlet way external pressuresection top plate rotating variable geometry scheme, it is guaranteed that the combined power adjustable air inlet way can normally work under all mach numbers, meanwhile, the contradiction that consideration cannot be given to supersonic velocity air inlet way low mach starting capacity and high mach number aerodynamic performance is avoided. The adjustable second-stage compression face is a unique motion component of the overall air inlet way, and one motor is used for achieving unidirection control over two geometrical parameters including air inlet way second-stage compression angles and the throat height.