Legal analysis: 1. The borrower can go to the developer or the housing authority to make a new copy. 2. If the borrower loses the loan contract before the bank mortgage, it is necessary for the borrower to declare the contract invalid. After the expiration of three months, he will apply for cancellation of the signed contract with relevant certificates and then sign a new contract with the developer. 3. If the application for a loan to buy a house is a provident fund loan and there is no original house purchase contract, the borrower can also provide information proof stamped by the local house trading center. Under normal circumstances, if the loan contract is lost, you can bring your valid identity certificate to the handling bank and ask the bank to give the actor a new original contract. If the actor is handling provident fund loans, he can bring his valid ID card to the provident fund center to check the files. The lawyer reminded friends who are about to borrow money that they must keep it safe after signing the loan contract. Because after paying off the mortgage loan, the borrower needs to apply for cancellation of the property right mortgage after handling the repayment certificate with the loan contract.

Legal basis: Article 470th of the Civil Code of People's Republic of China (PRC). The contents of a contract are agreed upon by the parties, and generally include the following terms: (1) the name and domicile of the parties; (2) Subject matter; (3) quantity; (4) quality; (5) Price or remuneration; (6) Time limit, place and method of performance; (7) Liability for breach of contract; (8) Methods for resolving disputes. The parties may conclude a contract by referring to the model texts of various contracts.