Analysing two concepts of people's role and The duties of Feligious democratic governmant from Imam Ali's perspective is the aim of this article . In the introductory part, the author focuses on people's role in a state from Imam Ali's point of view while he is discussing political legitimacy.In this context, he has dealt with issues such as; 1)people`s role in establishing religious state; 2)people`s role in on statemen in a religious state; 3)people`s role in consulting leaders in a religious state; 4)people`s right in questioning state and statemen; and 5) people`s duty in opposing a state when it does not observes revealed laws. In second part of the article, responsibilities of a democratic state, the author trys to describe Imam Ali's view points of those issues.