Study on computer generation of animations with Chinese traditional styles is of great importance for carrying forward Chinese traditional arts and enhancing the competitiveness of Chinese animations. Propitious clouds are one of the most typical Chinese-style auspicious patterns with a long history in China. However

most of previous research focuses on realistic cloud animations

while little effort has been paid to the cloud animation with traditional Chinese style. In this paper

a cloud model with traditional Chinese style is presented. First

we construct the cloud skeleton curve by use of eclipses

we then arrange a series of primitive circles with different radiuses along with points in the curve and obtain the cloud silhouette by a union of these circles. We construct the animation of silhouettes and cloud shapes by control primitive circles moving along the circumference whose center is on the skeleton curve. We take a dynamic silhouette point as start position and draw a spiral curve along the center of cloud. Experimental results show that the proposed model is able to generate a wide variety of animations of clouds in the traditional Chinese style.