Legal analysis: the conditions for the contract to take effect are the agreement of both parties, such as signature, seal and notarization. If one party seals the contract and the other party fails to seal it, one party has fulfilled its main obligations and the other party accepts it, and the contract is established. Otherwise, the contract is not established. In case the contract is not established, if the sealed party thinks that the contract can be performed and has made necessary preparations for the performance of the contract, which has caused economic losses, then the sealed party may bring a lawsuit to the people's court, requesting the people's court to order the party that has not signed and sealed to bear the liability for contracting negligence.

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.