Legal analysis: A private seal can replace a signature in terms of legal validity. If you sign a labor contract with an enterprise in practice, it is best to obtain the signature of the legal representative rather than the personal seal. If the parties conclude a contract in the form of a contract, the contract is established when both parties sign or seal it.

Legal basis: Article 490 of the "People's Republic of China and Civil Code" Where the parties conclude a contract in the form of a contract, the contract is established when both parties sign, seal or fingerprint. Before signing, sealing or fingerprinting, one party has performed its main obligations and the contract is established when the other party accepts it. Laws and administrative regulations stipulate or the parties agree that a contract should be concluded in written form. If the parties do not use written form but one party has performed its main obligations and the other party accepts it, the contract is established.