Using a revolutionary innovation in the design of mechanical transmission mechanism, in order to achieve as a bicycle walking function. In addition to exercise its functions, it can also be used as short-distance transport, which is equipped with the brake system, obstacles to timely braking. Adjustable speed: according to a child or adult age and physique, adjust the appropriate gear ratio, in order to achieve satisfactory walking speed. Lightweight and convenient: light vehicle weight, small size, easy to fold, with a larger carrying capacity characteristics.