A real-time rendering method of realistic snow scene with large scale is presented.Firstly

a snowflake physical model and a snowflake moving model in the snowfall are taken into account.Secondly

the wind velocity is separated into the average velocity and the random velocity

which simplifies the computation of wind field.The random velocity is yielded by Perlin noise and the results are stored in a 3D texture

which effectively alleviates the computing cost of the particle system.Thirdly

the snow accumulation model and snow melt model are presented and simulated.Finally

a particle system based on modern GPU technologies is implemented which improves the performance of rendering.The simulating results show that the method is suitable for large scale snow sceneries rendering.This method is applied to a helicopter simulator successfully.