According to Chinese laws, the parties conclude contracts in written, oral and other forms. The contract can be concluded orally, except for the contract that must be in written form as stipulated by laws and administrative regulations or agreed by the parties. Therefore, the oral sales contract should be recognized as valid.
 Article 490 of the Civil Code Where the parties enter into a contract in the form of a contract, the contract is formed when all the parties sign, seal or fingerprint. The contract is formed when one party has performed its main obligations and the other party has accepted them before signing, sealing or fingerprinting.
 A contract shall be concluded in writing as required by laws and administrative regulations or as agreed by the parties. A contract is formed when the parties fail to adopt a written form but one party has performed its main obligations and the other party has accepted it.