Taking the small and medium aircraft as research object, the brake system was studied and designed. A new powerbywire brake system with a simple structure and high reliability was proposed.The principle and main technical parameters of the brake system were introduced. The key technology was expounded, and the solutions were put forward. Because the system was antislip function, the control law of the brake system was deeply researched especially. Segmented pressure control method was proposed, so slipping phenomenon could be avoided effectively. Through numerical simulation calculation and ground sliding test, the design of the brake system was verified.