You can't. According to the query method, as long as the family is the first house, the down payment cannot be less than 30% of the total house price. To buy a 500,000 house, the down payment should be at least 500,000 times 30%, which is equal to 6,543.8+0.5 million. Down payment is the lowest proportion of down payment according to the national proportion when buying a house. Of course, the payment can be higher than this amount, but not lower than it, and the rest can be borrowed from the bank.