【裁判要旨】合同法强调契约自由的同时亦重视契约正义,契约自由的目的正是为了追求契约正义。对于丧失契约正义的合同,法律应予以救济。当发生情事变更导致合同利益关系严重失衡时,可以依据诚实信用原则变更合同条款,以维护契约正义。 【Referees Essentials】 Contract Law emphasizes freedom of contract at the same time also emphasizes contractual justice, the purpose of freedom of contract is precisely in pursuit of contractual justice. The law should be relieved of the contract for the loss of contractual justice. When a change of circumstances leads to a serious imbalance in the interest of the contract, the terms of the contract may be changed in accordance with the principle of good faith to maintain the contractual justice.