情事变更概念难以界定而且与不可抗力、与商业风险难以区分,实际操作困难,是我国合同法引入情事变更制度在立法中遭受障碍的原因。但是情势变更原则具有衡平合同双方当事人的作用,符合法律追求实质公平正义的价值理念,理应在立法中体现出来。 Difficult to define the concept of change of circumstances and with the force majeure, difficult to distinguish between business risks and practical difficulties, the introduction of the contract change law in our country, the reasons for the obstacles in the legislation. However, the principle of changing circumstances has the value of balancing the parties to the contract and the value concept of pursuing substantive fairness and justice in accordance with the law, which should be reflected in the legislation.