In case of conflict between the supplementary agreement and the original contract, the contents of the supplementary agreement shall be taken as the standard. The parties shall fully perform their obligations as agreed. The parties shall abide by the principle of good faith and perform the obligations of notification, assistance, confidentiality, etc. according to the nature, purpose and trading habits of the contract. When performing the contract, the parties shall avoid wasting resources, polluting the environment and destroying the ecology. After the contract comes into force, if the parties have not agreed or clearly agreed on the quality, price, remuneration or place of performance, they may supplement the agreement; If a supplementary agreement cannot be reached, it shall be determined in accordance with the relevant provisions of the contract or the transaction customs.
 Legal basis
 Article 509 of the Civil Code of the People's Republic of China [Principles of Contract Performance] The parties shall fully perform their obligations as agreed.
 The parties shall abide by the principle of good faith and perform the obligations of notification, assistance, confidentiality, etc. according to the nature, purpose and trading habits of the contract.
 In performing the contract, the parties shall avoid wasting resources, polluting the environment and destroying the ecology.