The supplementary agreement in the blank space of the contract must be signed. After the contract comes into effect, if the parties have not agreed on matters or the matters are unclear, they can supplement them by agreement. The supplementary agreement must be signed, sealed or fingerprinted by both parties, otherwise it will not be legally effective.

Legal Basis

Article 490 of the "People's Republic of China and Civil Code"

If the parties conclude a contract in the form of a contract, the parties shall The contract is established when all 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 or the parties agree that a contract should be concluded in writing. If the parties do not use writing but one party has performed its main obligations and the other party accepts it, the contract is established.

Article 510

After the contract takes effect, if the parties have not agreed on quality, price or remuneration, place of performance, etc. or the agreement is unclear, they may reach an agreement to supplement it; if they cannot reach an agreement, they may If the agreement is supplemented, it shall be determined in accordance with the relevant terms of the contract or transaction practices.