Abstract: Spring analogy and remeshing method for dynamic unstructured grids are used to solve the problem of plates dispersion under low velocity flow. The process of plates dispersion is dynamically simulated by solving the Navier-Stokes equations coupled with sixdegrees of freedom equations. The computational solution reveals the variations of velocity, trajectory, forces and flow characteristics effectively. The separating principle and aerodynamic interference among multiplates are analysed based on the results. In the unsteady separating process the flow between single plate and mainbody is complex along with the form, movement and decline of wake. The nonlinear aerodynamic pressure on plate is the main reason for separation.