Legal analysis: A contract has no official seal. As long as it is not a contract in which the parties agree on the effective time and conditions, or a contract in which examination and approval procedures are required by law, it will take effect after being stamped with the official seal. According to the law, a contract is established when the parties sign, seal or press their fingerprints, while a legally established contract takes effect when it is established. So, if you sign or seal, the contract will come into effect. If the parties conclude a contract in the form of a contract, the contract shall be established when both parties sign or seal it. We can't refute this, that is, we can't think that as long as both parties don't sign or seal the contract, it won't be established. A contract concluded in the form of a contract is also established if one party fulfills its main obligations and the other party accepts it before signing or sealing it. 1. Only one party signs or seals the contract. If one party (whether the signatory or the seal) has fulfilled the main obligations of the contract and is accepted by the other party, the contract is established, regardless of whether the recipient has fulfilled its due obligations; Only one party signs or seals the contract. If one party (whether signed or sealed) performs the main obligations of the contract, but it is not accepted by the other party, the contract is not established; 3, only one party signed or sealed the contract, but both parties failed to fulfill the main obligations of the contract, the contract is not established; 4. If both parties have not signed or sealed the contract, but one party has fulfilled its main obligations and is accepted by the other party, the contract is established, regardless of whether the recipient has fulfilled its due obligations.

Legal basis: Article 502 of the Civil Code of People's Republic of China (PRC), a contract established according to law shall come into effect upon its establishment, unless otherwise stipulated by law or agreed by the parties. In accordance with the provisions of laws and administrative regulations, if the contract should go through the approval procedures, such provisions shall prevail. If the failure to go through the formalities such as approval affects the effectiveness of the contract, it will not affect the performance of the obligation clauses such as approval and the effectiveness of relevant clauses in the contract. If the party that should go through the formalities for approval fails to perform its obligations, the other party may require it to bear the responsibility for violating its obligations. The modification, assignment and dissolution of a contract shall be subject to the provisions of laws and administrative regulations, and the provisions of the preceding paragraph shall apply and shall be subject to approval.