The invention discloses a major structure of an energy-saving motion device which consists of an introduction orifice that has an inner layer and an outer layer, a fluid-layered channel, a loop hole channel, a lead-out orifice channel, and combines with installed windshields, doors and baffles into a car that has novel model and convenient production, and saves cost; an introduction orifice of lateral fluid that is arranged on a car body and a balancing introduction orifice in the bottom of the car are communicated with a channel, a motor is arranged inside the lead-out orifice, a rotating head that is driven by the motor and a wind indicator that is driven by the fluid are arranged in the channel passed by the fluid, thus driving an electric generator to charge a fuel battery for drivingthe motor. The motor, the rotating head, an infinite variable speed controller, a speed reducer, a compensating gear, two semi-shafts and wheels are connected by control boards; the motor drives the wheels to rotate, and eliminates lifting resistance and reduces fluid resistance; the device has enhanced adherence between the wheels and the ground, thus increasing security and stability; the device major structure is formed by channels, thus saving the structures such as pistons, accelerator pedals and so on, and consequently the invention leads the weight to be lighter than the weight of the existing cars by one fourth and saves over two-thirds energy. .