Legal analysis: there are three parties to the tripartite agreement. The tripartite agreement is not established if both parties sign, seal or press their handprints, and the third party fails to perform the main obligations of the contract or does not approve the contents of the contract; If the third party has fulfilled its main obligations before signing, sealing or fingerprinting, and the other two parties have accepted it, the tripartite agreement is established.

Legal basis: Civil Law

Article 490 Where the parties conclude a contract in the form of a contract, the contract is formed 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.

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.