Evolution of cloud computing within the last several years is regarded as one of the most important progresses of computations history. Although lots of research has been done in the field of this technology recently, the essential demand for understanding the problems and constraints related to cloud electronic commerce is still highly felt. This article shows that cloud computing has a wide prospect in e-commerce applications and this matter is shown through describing the cloud computing features, concepts and analyzing the improvement of e-commerce by it. In this article, strength and weakness points, opportunities, threats of cloud computing industry and the impacts of this technology on e-commerce will be stated.