The original car used a non-independent suspension with two wheels mounted on an integral axle because it was simple and sturdy. However, the problem soon appeared. When the car with non-independent suspension rises, the other side of the wheel will inevitably fall, so the body can not be made very low, and the space for the suspension to swing left and right must be given. The chassis is high, and the roll is inevitably more serious when the car is turning. Especially when the steering wheel is also used as a non-independent suspension, it is easy to cause a rollover accident. Dangerous issues are usually more likely to be taken seriously. Soon, in 1928, the Frenchman with Quar made the two front wheels elastically connected to the frame on a steam-tracting car he built. This was the earliest independent suspension. The design of this independent suspension was at that time. It has an epoch-making significance. Soon, the front wheels of European-made cars, that is, the steering wheels, generally began to use independent suspension, but the rear wheel suspension still uses non-independent suspension. For non-sports cars, this structure is economical and sufficient. In the 1980s, Japanese cars were backward in technology compared with Europe and the United States, and competition forced them to find a breakthrough in technology to upgrade their products and increase their own worth. Independent suspension became one of their choices. Soon, a large number of Japanese-made front and rear wheels were rushed to the market with independent suspension cars, and formed a fashion standard. At this time, European and American auto manufacturers still use the front wheel independent, the rear wheel is not independent design, and actively improve. And it turns out that the result of this old design is more than the application of new technology. But for the market, many forms are more important than connotation. Most consumers tend to care only about trends and fashion. When fully independent suspension becomes a "high-profile" standard, the Japanese have achieved great commercial success. After the time has passed, the Japanese auto industry began to reflect on the use of independent suspension in the rear wheel after the expected benefits. The batch of car manufacturers headed by Nissan has also built a civilian car with non-independent suspension from the rear wheel. "The ground has given a lot of seemingly high-tech names to this suspension, but in the end it is still a non-independent suspension.