Based on the analysis of the horizontal vortex tube structure,it is found that the dynamic structure of the rainband is not always the rotation-rising upward around the center of typhoon eye.

On the basis of the theories of baroclinic vorticity development,this paper discusses the conversion of horizontal vorticity into vertical vorticity in the large-scale motion of the atmosphere,and then the conversion terms is employed to describe the evolvement of the summer monsoon.

Started from the analysis on the boundary characteristics of airflow on dune, an inverse ratio relationship between horizontal vorticity fraction \%(ξ y )\% and the height \%(z)\% was derived.