Abstract: In this paper, a comprehensive research has been done on the model and algorithm of the transportation network traffic assignment problem. The paper systematically investigates the research works on traffic assignment and analyzes the existing problems in the current research. In accordance with the characteristics of the Chinese transportation network traffic assignment, this paper, absorbing the ideas of the achievements of operation research and computer science, establishes a more reasonable and practical multiple objective traffic assignment optimization model. The assignment solutions are more approximate to practical problem because of considering some important characteristics of traffic assignment as the functions of transportation flows in the process of building model. Meanwhile, the solution strategy of the model is discussed. In order to solve the problem effectively, we study and design a robust, high-effective,practical self-adaptive search algorithm.

Key words: traffic assignment, multiple objective optimization, model, algorithm