1. Online banking inquiry: users can log in to official website of their own loan bank, then find their own loan information and check the loan contract number. The last 17 of the general loan receipt number is a number, and the first 14 is the commercial loan contract number.

2. Inquiry of outlets: Users can directly go to the bank counter where they borrow money, and they can handle the inquiry business with their ID cards.

3. Mobile banking inquiry: Users only need to log in to their own loan bank, and then find the housing mortgage loan contract, and they can see their own commercial loan contract number.

If the user's personal housing loan is a provident fund loan, then you need to log in to the provident fund management center in official website, where you are located, find the loan information and find your own provident fund loan contract number.