Legal analysis: The act of alteration is a unilateral change of the content of the contract. Because it violates the principle of autonomy of will, the content of the contract cannot be changed without the consultation of both parties to the contract, and it has no binding force on the parties to the contract. Unilateral alteration of a contract does not affect the validity of the contract. A contract that has been established is still a valid contract, but the altered content is not binding on the contract.

Legal basis: Article 502 of the "People's Republic of China and Civil Code" A contract established in accordance with the law shall take effect from the time of establishment, unless otherwise provided by law or otherwise agreed by the parties. In accordance with the provisions of laws and administrative regulations, if the contract should be subject to approval and other procedures, the provisions shall be followed. If the failure to go through approval and other procedures affects the effectiveness of the contract, it will not affect the effectiveness of the contract's obligation clauses such as submission for approval and related clauses. If the party that should go through the application approval and other procedures fails to perform its obligations, the other party may request that it bear liability for violating such obligations. In accordance with the provisions of laws and administrative regulations, if the modification, transfer, termination, etc. of a contract require approval and other procedures, the provisions of the preceding paragraph shall apply.

Article 543: The contract may be modified if the parties reach consensus through consultation.

Article 544 If the parties’ agreement on the content of the contract modification is unclear, it is presumed that the contract has not been modified.