Legal analysis: depending on the specific situation. It is valid if it meets the following conditions: (1) The parties to a contract have corresponding capacity for civil rights and capacity for civil conduct; (two) the intention of the parties to the contract is true; (3) It does not violate the law or public interests.

Legal basis: Article 490 of the General Principles of Civil Law of People's Republic of China (PRC), 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. A contract shall be concluded in written form as stipulated by laws, administrative regulations or agreed by the parties. If the parties do not do this in writing, but one party has fulfilled its main obligations and the other party accepts it, the contract is established.