Influenced by the random arrival of vessel,the dynamic traffic flow of container terminals is full of randomness.How to forecast the traffic flow is very important in the planning of the collecting and distributing systems.Most present studies forecasted the traffic flow based on the statistical information with the method of unbalance factor.But it doesn’t suit for the newly built port area very well for the lacking of statistical information.In this study,we construct a dynamic traffic simulation model for the container terminal based on the random arrival of vessel,forecast the real time traffic flow reasonably by simulating the process from the arriving of vessel to the leaving of container and verify the reliability of the simulation model.In the end,depending on the regulation of the arrival of vessel,we forecast the collecting and distributing traffic volume of different periods taking a newly built international container terminal for example.This provides a scientific basis for the instalment construction of the collecting and distributing system.