Commodity market refers to a fixed location, facilities, there are several operators admission management, tax respectively, the market management is responsible for the management, property management, centralized, publicly traded for tangible commodity trading places. This concept has three meanings: first, commodity market is a commodity trading place composed of transaction subject, transaction object, transaction carrier and other elements. Second, the commodity market is the place to provide services, which is a trading venue for producers and consumers to provide a certain quality of service. Third, the commodity market is the place to provide sensory experience. Therefore, commodity market is the product of commodity economy development to a certain stage. In the American society of automotive engineers standards SAEJ 687 c for automobile is defined as: power driven by itself, with a driving device, can in a fixed orbit outside the road or on regional transport passenger and cargo or vehicle traction vehicles. Cars are divided into bicycles and trains according to the overall structure. Cycling is a basic form. 4 x 2, 6 x 4, 4 x 4 and 6 x 6 are used to represent the driving characteristics. The previous number represents the total number of wheels (double tire and still count a wheel), and the latter number indicates the number of driving wheels. If all wheels are driven wheels are called all-wheel drive vehicles. The train is made up of a tractor or a bicycle trailer or semi-trailer. Car generally can be divided into the following categories, according to the use cars, buses, freight cars (commonly known as the truck), off-road vehicle, traction motor, dump truck, special vehicles, semi-trailer and special semi-trailer.