Legal analysis: private seal: usually with personal name or other words as its content; Banks do not specify the size of private seals, but generally require regular script to have square seals. Private seal has certain legal effect, but it cannot be an element of legal effect alone. It must be used with other materials to have legal effect. A private seal cannot represent a signature. If it is to have legal effect, it must be filed or notarized, otherwise it has no legal effect.

Legal basis: Article 490 of the Civil Code of People's Republic of China (PRC). If the parties enter into a contract in the form of a contract, the contract shall be 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.