The signature and seal of the contract are valid. To judge whether a contract is valid or not, it mainly depends on whether the parties to the contract have civil capacity, whether the contract is the true expression of the parties, and whether the contents of the contract conform to the legal provisions. Its content is legal and valid, and it is valid if it meets the conditions for entry into force. You can sign or stamp at the signature.

Legal objectivity:

Article 143 of the Civil Law of People's Republic of China (PRC) is valid if a civil juristic act meets the following conditions: (1) The actor has corresponding capacity for civil conduct; (2) the meaning is true; (three) does not violate the mandatory provisions of laws and administrative regulations, and does not violate public order and good customs. Article 490 of the Civil Code of People's Republic of China (PRC): If the parties conclude a contract in the form of a contract, the contract is concluded when the parties sign, seal or fingerprint it. Before signing, sealing or fingerprinting, one party has fulfilled its main obligations, and the contract is established when the other party accepts it.