Trust interests losses is like that : because of one side ' s false action in concluding a treaty which makes contract invalid or untenable and all kinds of fees and other losses ca n ' t be compensated of fault in concluding a treaty can take place in the course of concluding a treaty or after the contract taking effect 3 ) the side who breaks the previous contract obligation makes mistakes 信赖利益损失，是指因另一方的缔约过失行为而使合同不能成立或无效，导致信赖人所支付的各种费用和其他损失不能得到弥补。缔约过失上的损失既可发生于缔约过程中，也可发生于合同有效成立后。 ( 3 )违反先合同义务的一方有过错。
The occidental countries with developed market economy have been researching on the subject of expenditure compensation - claiming for more than 50 years , as a result , they possess of rich experience and form certain systems of theories and relatively mature procedure methods , which effectively and more reasonably divide the contraction risks burdened by the two parties of the contract and play a very important role in improving the management of both the enterprise and the project 欧美等市场经济发达国家对费用索赔的研究已有五十多年的历史，积累了比较丰富的经验，形成了一定的理论体系和比较完善的程序方法。它有效地使合同双方承包风险分担趋向合理，对提高企业和工程项目管理水平起着重要的促进作用。
Secondly , e - commerce promotes the rapid development of economic , and at the same time , it enriches the means to achieve the interests and provides a solid foundation for the realization of the justice of contract in the pattern of modern e - commerce . the emergence of network has enriched the information gathering channels . and the justified valuation based on the rich information is 此外,电子商务快捷的通讯手段使合同法中要约、承诺的撤回在事实上已经无法实现;网络空间的虚拟化和网民年龄的低龄化,加大了交易主体适格性确认的难度;系统使用合同的出现要求我们增加专门的合同类型以进行规制。
But in the course of contracting , both parties have entered into a special mutual - reliance relationship from the general social relationship . if one party ' s defaulting results in non - formation , invalidity , or rescission of a contract , non - defaulting party will bear the damages in interest brought about by trusting other party 但在缔约阶段，双方当事人已由一般社会关系进入到一种互相信赖的特定关系中，如果因为一方的过错行为使合同不成立、无效或被撤销等，无过失一方就会因信赖而出现利益上的损失。
