Abstract: A highly effective method of modeling and rendering based on Lattice Boltzmann model(LBM) to simulate the fluid with free surface is presented.Firstly,the LBM model based on shallow water equations is adopted to model the fluid volume and calculate the surface height field.And then a new method combined with Marching Cube and free surface algorithm is proposed to extract the fluid surface.After that,an external stack mechanism of moving obstacles and adaptive grid refinement algorithm are used to realize fluid interaction and reconstruction of surface grid.Finally,the hardware acceleration technology is adopted to achieve realistic rendering of fluid with different free surface,including streams,droplet,and water in pools,etc.