First of all, only one party signs or seals the contract. If one party (whether it is the one who signs or seals) fulfills 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;
The second is that only one party signs or seals the contract. If one party (whether the signatory or the seal party) performs the main obligations of the contract, but it is not accepted by the other party, the contract is not established;
The third is that only one party signs or seals the contract, but neither party has fulfilled the main obligations of the contract, and the contract is not established;
The fourth is that both parties have not signed or sealed the contract, but one party has fulfilled its main obligations and is accepted by the other party, and the contract is established, regardless of whether the recipient has fulfilled its due obligations;
The fifth is that the contract is not signed or sealed by both parties, and if one party has fulfilled its main obligations but has not been accepted by the other party, the contract is not established;
The sixth is that neither party has signed or sealed the contract, and neither party has fulfilled the main obligations of the contract, so the contract is not established.
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.