It can achieve the flexible switching of 6 kinds of car modes by the flexible switching technology. In the body side assembly line, there are high-density robots, multiple working faces turntables, sliders and etc which satisfies for the mix-lined production of six kinds of car modes and the completion of complex production process such as automatic welding on both sides of several types of vehicles on the same production line. By using the technology of the visual system and online detection technique, the robots can grasp the body parts automatically, and the productivity of the assembly line has been highly improved too. With the BESFIT's self-developed high-precision transport vehicle, the robots can load and unload automatically even though they work in high production line, and the material storage in the sites reduced too. That is very important to the production line. The EMS can transport the materials to pointed place by reading the vehicle's code accurately, then all of the material can be stored separately and the assembly line can get the right loading parts. The Automated Guided Carts (or AGC) system can barge the material automatically and constantly, which will increase the rate of the production line automation to 95% or more.