In view of the severity of oceanic pollution,based on the finite volume coastal ocean model(FVCOM),a Lagrangian particle-tracking model was used to numerically investigate the coastal pollution transport and water exchange capability in Tangdao Bay,in China.The severe pollution in the bay was numerically simulated by releasing and tracking particles inside it.The simulation results demonstrate that the water exchange capability in the bay is very low.Once the bay has suffered pollution,a long period will be required before the environment can purify itself.In order to eliminate or at least reduce the pollution level, environmental improvement measures have been proposed to enhance the seawater exchange capability and speed up the water purification inside the bay.The study findings presented in this paper are believed to be instructive and useful for future environmental policy makers and it is also anticipated that the numerical model in this paper can serve as an effective technological tool to study many emerging coastal environment problems.