The density of our pipe network is 4.85 km / sq km, while the developed countries is 16.21 km / sq km. China's automobile industry get the very rapid development. By the end of 2007, China's auto production has been ranked third in the world, over Germany, after the United States and Japan, while the car sales second only to the United States. With the surge in the number of cars, Traffic pressure of big cities in China greatly increased, an urgent need for new, expansion and renovation of the city roads, traffic management facilities and a variety of parking facilities. According to official statistics due to the growth in the number of cars is much higher than the growth of the parking, our annual parking gap up to more than 300 million city parking, far short of needs. So the mechanical parking device is the only way to save energy and land.