Abstract: This study focuses on the collaborative behavior analysis of the different carriers in the intermodal freight transport,a making-decision problem on Cooperation and competition between the two oligopoly transportation firms which provide complementary transport service is considered.Based on the game theory,a two stage dynamic game model with complete information on cooperation investment and price strategies is formulated.We discuss the existence of unique subgame perfect Nash equilibrium of the game.Using backward induction approach to solve the problem,and some important conclusions are then deduced.In the end,a numerical example based on the immune genetic algorithm for solving the proposed model is provided to verify the validity of conclusions.

Key words: intermodal freight transport, collaborative behavior, two stage dynamic game model, immune genetic algorithm