Abstract Participating of demos in decision making processes of their society have had been the scientists utopia. Communication and information technologies paved the way for participation of the people in their fate. By the way, the most important construct in this equation is public trust that determines the level and specificatian of democracy To explain the role of trust in electronic government, we took advantages of justice pentagon (five dimensional) model and examined public administrators, faculty members and students opinion about electronic government, public trust and democracy. The results support our electronic government – justice – trust and democracy conceptual model.