The evolution of cloud computing has had a significant effect on our lives and it has brought many benefits. Cloud computing is a style of computing which is formed from the aggregation and development of technologies such as grid computing distributed computing, parallel computing and service-oriented architecture and its exciting for governments and private companies, and it has eager them to take advantage of this technology. Because in this model no needed to additional costs for equipment and resources to respond to the request of customers, however in terms of demand and workload, company lease and take possession of the required resources, such as servers and virtual sources. In this paper, we studied how to use cloud computing in e-government and tried to identify the benefits of the cloud to use in the e-government and offer proposals to overcome its shortcomings, encourage and partnership of governments and people to use this economical, green and new technology.