Abstract: Precipitation phenomenon in liquid is one of general phenomenon in nature or in research. It has very important significance for reappearing precipitation course and addressing precipitation disciplinarians by simulation. Based on particle system method, the mathematics model for precipitation phenomenon in lictuid was brought out, and the implementation of precipitation phenomenon in liquid was particularly described,more over, the technologies for real-time and reality were discussed. It is demonstrated by experiment that the method is not only simply, easy, and satisfying for requirements of real-time and reality, but also has preferable commonality, it's fit for other occasion by little modify.

Key words: Precipitation phenomenon, Particle system, OpenGL, Virtual reality