1. Car purchase invoice, certificate, vehicle certificate and motor vehicle registration certificate: the invoice and vehicle certificate are necessary documents for the owner, so you must ask the dealer for the invoice and certificate when buying a car. Among them, it is necessary to check whether the vehicle certificate is consistent with the nameplate information inside the vehicle, such as engine number, frame number, factory date, exhaust volume and model. 2. Three Guarantees Certificate, Vehicle Instruction Manual and New Car Delivery Confirmation Sheet: The vehicle instruction manual and the "Three Guarantees" certificate are all certificates for future vehicle maintenance and warranty, so be sure to check them and keep them away. In addition, the new car delivery confirmation form is a form for the 4S shop and the owner to verify whether all relevant documents of the vehicle have been delivered, which the owner can check. 3. Driver's license and vehicle insurance policy: If the 4S shop is responsible for obtaining the license and handling insurance, it also needs to get the original insurance policy, insurance invoice, compulsory insurance invoice, vehicle and vessel tax invoice, purchase tax invoice, tax payment certificate and compulsory insurance sign from the seller. The traffic insurance sign should be posted on the upper right of the front windshield in time, and the driving license and driving license should be carried with you.