摘要:情势变更原则是现代大多数国家合同法中的一项重要原则，也是国际商事交易中解决因经济环境异常变动所造成的合同履行困难的一项重要法律制度。我国《中华人民共和国合同法》司法解释（二）的出台标志着情势变更原则在司法实践中的正式确立。然而，由于我国法律对情势变更的规定过于原则概括，缺乏可操作性，因此，进一步明确情势变更原则的概念，划定情势变更原则的适用范围及法律效力成为一个非常迫切的问题。
本文拟就从就情势变更原则在我国建立的必要性入手展开讨论，进一步指出该原则在我国存在的问题并根据我国的现状进行分析，最后笔者再通过借鉴情势变更原则在国外的经验，对我国情势变更原则的完善提出若干建议。
关键词：情势变更原则；适用范围；法律效力；衔接
Abstract:The principle of change of circumstances is an important principle of contract law in the modern most countries, an important legal system to resolve difficulties to fulfill the contract caused by abnormal changes in the economic environment of international commercial transactions. The introduction of Chain’s Judicial Interpretation of Contract Law (2) indicates that the principle of change of circumstance has formally established in the judicial practice.However,the law of the principle of change of circumstances is too abstract, and lacking of maneuverability in our country, therefore,further clarifing the conception of the principle of change of circumstances, delimiting the scope of application and the force of law of the principle of change of circumstances become a very urgent problem.
This article will have a discussion on the necessity of the principle of change of circumstances that set up at my country, further pointed out the principle of the problems that exist in our country and analyzed the present situation in China, and then, through drawing on the experience exist in other countries, author puts forward several proposals to improve the principle of change of circumstances.
Key words: principle of change of circumstances; applicable scope;legal force; links up
所谓情势变更原则，是指合同有效成立之后、履行完毕之前，如果出现某种不可归责于双方当事人且非不可抗力造成的，不属于商业风险的客观变化，导致合同存在的基础动摇或丧失，若继续履行合同会给一方当事人造成显失公平的结果或不能达到合同目的的，则应允许当事人变更或解除合同的一种制度。最高人民法院对情势变更原则作出的明确规定，在一定程度上弥补了立法上的缺漏，有利于规范司法实践中对情势变更问题的处理。但是，为了适应因经济因素急剧变化的现代社会的发展需要、均衡当事人的合法权益，则有必要对情势变更原则再作深入探讨以及完善我国关于情势变更原则的相关立法规定。
