Rent-seeking behavior in the public project is a problem which the construction administrative departments at all levels always attach great importance to. This paper analyzed the causes and harms of rent-seeking behavior in the public project. At the same time, according to the hypothesis that supervision department can drive its right impartially, this paper established a tripartite incomplete information static game model in the public project, and then analyzed the own rent-seeking behavior of supervision department, and got the specific measures that could reduce rent-seeking behavior.