After the car and the 4S shop reached a car purchase agreement, both parties signed a written car purchase contract in duplicate, one for each party. If the 4S store doesn't give the contract to the customer, it is a wrong behavior, and the customer can ask for it directly. If the other party refuses, you can directly request to terminate the contract. Because the car purchase contract is a formal sales contract signed by the car buyer and the dealer, it is a basis to ensure the rights and interests of both the dealer and the consumer. When signing a car purchase contract, it is necessary to clearly stipulate the car brand, car identification number, engine number, car code (frame number) and other essential elements of the car itself, especially the car code and car identification number should be written at the same time to prevent the car dealer from changing the packaging; The main configuration of the vehicle, color (specific to the color of the seat), hand-row or self-row, onboard documents, etc. ; The price shall specify the total vehicle transaction price (bare car price or package price), payment method and time limit. In addition, the contract also stipulates that the liability for breach of contract should be clear, the after-sales service should be indicated and so on.