You can't. The car purchase contract will not be officially issued until all the car purchase money has been paid, and the down payment is regarded as part of the car purchase money, not the full amount. Therefore, the other party will not issue a car purchase contract before paying off all the car purchase money. BYD was founded in February, 1995. After more than 20 years of rapid development, more than 30 industrial parks have been established around the world, realizing the strategic layout of six continents.