Abstract: This paper deals with decision making method on the highway pricing and investment for private companies,which plans to build a private toll road parallel to an existing free road in a road network under a BOT scheme.Through analyzing the game actions between the private companies and passages under a BOT scheme,the paper establishes the decision making model of the toll road pricing and investment separately,and comes to some considerably important conclusion by discussing the property of the Nash strategy solution,which is of instructional significance in the traffic BOT project practice.

Key words: BOT, toll road, game theory