Need to sign a contract. In the actual operation process, a written contract should be signed, in which the deposit amount, delivery period and delivery method are agreed. Article 490 of the Civil Code If the parties conclude a contract in the form of a contract, the contract is established when the parties sign, seal or press their fingerprints. Before signing, sealing or fingerprinting, one party has fulfilled its main obligations, and the contract is established when the other party accepts it.

Legal objectivity:

The first paragraph of Article 586 of the Civil Code stipulates that the parties may agree that one party shall pay a deposit to the other party as a guarantee for the creditor's rights. The deposit contract is established when the deposit is actually paid. Article 587 of the Civil Code: If the debtor performs the debt, the deposit shall be used as the price or recovered. If the party paying the deposit fails to perform the debt or the performance of the debt is not in conformity with the agreement, thus the purpose of the contract cannot be achieved, it has no right to request the return of the deposit; If the party receiving the deposit fails to perform the debt or the performance of the debt does not conform to the agreement, so that the purpose of the contract cannot be achieved, the deposit shall be returned twice.