What do you mean by front loading and back loading? Pre-assembly means that the main engine factory provides supporting facilities for the automobile factory, similar to brake pads, three filters and wipers, and most of them are provided by the parts factory. After-loading means that the products produced by the main engine factory are sold through dealers, mainly through channels. The original supporting products are absolutely the most secure in system stability, but these products have few functions, so it will be more advantageous to install them after use. However, there is little difference between the exclusive products of 4S stores and the products in the aftermarket, except that the exclusive products of 4S stores are a little more expensive, and the brands of cars and machines are weakened, mostly in the name of special cars. The quality of vehicle accessories, special products for 4S shops and afterloaded products is reassuring, but it does not mean that the afterloaded products are of poor quality. Now in the aftermarket, the overall quality has improved a lot, and the price has also decreased a lot. In addition, the installation methods of the Internet of Vehicles hardware can also be divided into pre-installation and post-installation. The front-end networking is mainly based on TCU technology, and the rear-end networking is mostly realized by connecting derivative devices through OBD interface. In terms of market olfactory sensitivity, post-market enterprises have the advantages of flexible strategy and rapid innovation. The advantage of the former assembly plant lies in the in-depth grasp of automobile systems and new products, as well as the preliminary preparation and cooperation with Internet companies after joining. @20 19