South Dushan, Guizhou Province, is one of the areas of well-developed karst in China. A criss-cross network of narrow polje, Karst trough valley and subterranean rivers shows that the Karst develops in this area quite well. In this paper we start with karst development controlled by structual system, and by tectonic stress field. Then we emphatically discuss that karst landform and karst groundwater network system are controlled by both structural network and joint deformation network. Finally we use the methods of mathematical statistics to discuss the character of relationships between them.