A method of simulation of spray using particle systems is presented in this paper. The spray body is a particle system composed of square pieces with high transparency. The spray body moves in space with the spray mouth. The shape and visual effect ofthe spray body are determined by the size, transparency and Kinematic parameters of thesquare pieces. All pieces intersected with one sight ray contribute to corllputing of the pixel value of the sight ray. This method is generally applicable to simulation of other fuzzyobjects sllch as smoke, water and cloud.