针对冷却塔中螺旋结构类型的气液交换塔，提出其内部螺旋塔板形状的设计方法，包括塔壁上外螺旋线和塔中心轴管上内螺旋线的位置确定，以及两线之间螺旋曲面板在平面上的拓扑尺寸。通过塔的几何参数确定螺旋曲面板设计的关键参数，可实现扭曲状塔板与塔壁及内轴的准确配合。

A spiral structure of cooling tower is designed for heat exchange of gas & liquid.The method includes the locating of the outer spiral line on the tower wall and the inner spiral line on the central axial pipe, as well as the topologic shape in the plane for the curving board between the two spiral lines. According to the basic parameters of cooling tower, the critic parameters of spiral curving board can be ascertainable, so as to accurately link up the tower board with the tower wall and the inner axial pipe.