First, carefully check the relevant documents. The development project must obtain the Land Use Right Certificate, the Construction Land Planning Permit, the Construction Project Planning Permit and the Construction Project Construction Permit; Check whether the developer has obtained the Commercial Housing Sales (Pre-sale) Permit, and verify whether the house he intends to buy is within the range of the building number listed in the Commercial Housing Sales (Pre-sale) Permit. Second, pay attention to the deposit clause. When buyers buy faster houses, they usually pay a deposit to the developer. According to the Guarantee Law, the deposit amount agreed by both parties cannot exceed 2% of the total contract price. Third, distinguish the deposit from the advance payment. Fourth, pay attention to the area in the purchase contract. Fifth, pay attention to the force majeure clause in the purchase contract. Delaying the delivery of the house is one of the most prominent problems in the commercial housing transaction. In order to avoid the liability for breach of contract, developers often use force majeure as an excuse. In order to avoid losses in this respect, buyers must attach great importance to the relevant clauses related to force majeure when signing the contract. VI. Agreement on the obligations of the developer's property right certificate.