The diffusion process of e-government becomes one of the central research issues in many countries. This study intends to investigate the internal and the external factors affecting the process of e-government diffusion. The study provides theoretical framework through explaining each element and supporting literatures that contribute to develop the conceptual model. we develop a conceptual model that shows how e-government adoption by government impact the level of corruption, the service efficiency, employees training, and therefore the implementation, and then how these factors impact citizens trust in government and internet, therefore their attitude to adopt e-government service. The model of technology acceptance (TAM), diffusion of innovation (DOI), and theory of reasoned action (TRA) play an important role in developing our conceptual model. The conceptual model provides a foundation for further empirical testing for the factors influencing the diffusion of e-government services.