This survey has been conduced to observe what factors effect e-government adoption in Iran. The considered research constructs includes Demographic factors i.e. age, gender and education, IT knowledge, Internet access, Trust, Perceived usefulness, Perceived ease of use and System and Web characteristics i.e. Reliability, Self-Service and linkage. The Structural Equation Modeling (SEM) is used to examine the relations. The results indicate that IT knowledge, Internet access, Perceived usefulness and Self-Service have significant direct effect on e-government adoption. The results are significantly useful for successful deployment of e- government. Further research can also be applied using the obtained results to identify the indirect effects of the constructs. At the end some suggestions offered to governors to good implementing e-government in Iran.