Abstract: Agent Construction System is a new mode of government investment project management, but the fact that the agent fee is comparatively low currently restricts its development. In this thesis, the status of current agent fee is analyzed, and then the agent fee model under the Agent Construction System is established according to the characters of Principal-Agent relationship of Agent Construction System. It is believed that the model and the suggestions to the reform of Agent Construction System presented in this paper will be helpful to the practice of Agent Construction System.