Abstract: Because the flying wing aircraft with large aspect ratio cancels the t raditional stabilizers and control surfaces which are used in traditional configur ation, many disadvantages of dynamic characteristic arise. The aerodynamics char acteristic of the innovative control surfaces which are implemented on the flyin g wing aircraft with large aspect ratio were introduced, and elevon and split rud der were involved. And the control effects on three axis were analyzed basing on computetional fluid dynamics(CFD) method. The concept of control volume was imp orted to introduce parameters-based method of control surfaces design. The cont rol effect requirements of the control surfaces were also evaluated. The origina l design of certain aircraft′s control surfaces was modified. An practical suit of steps for control surfaces design which can be used in flying wing aircraft with large aspect ratio has been provided.