A procedure, to make realistic Computer Graphics (CG) visualization of collapse behavior of embankment, is presented. The Smoothed Partice Hydrodynamics (SPH) analysis is conducted to simulate the collapse behavior of the embankment and it is shown that the results from the SPH analysis and the experimental ones are in good agreement. For the purpose of making realistic CG, new particles are generated around the existing ones after the SPH analysis due to the particle deficiency. The collapse behavior is described well in the present CG.