Legal analysis: 1, the number of general contracts, and the purchase contract signed by the developer in triplicate. In triplicate, one for the developer, one for the buyer and one for the bank, one for the developer to handle the property right certificate, one for the bank to handle the mortgage and one for the buyer to handle the house certificate. 2, the number of mortgage contracts, the mortgage situation is generally five copies of the purchase contract, one for the customer, one for the company, one for the real estate bureau, one for the bank and one for the deed tax. Generally, the full payment and installment payment are made in quadruplicate, one for the customer's own use, one for the company's record, one for the real estate bureau's record and one for the record when the deed tax is paid.

Legal basis: Article 16 of People's Republic of China (PRC) Labor Contract Law shall come into effect after the employer and the employee reach an agreement through consultation, and the text of the labor contract shall be signed or sealed by both the employer and the employee. The text of the labor contract shall be held by both the employer and the employee, and the labor contract shall be given to the employee in duplicate.