GEOCHEMICAL studies of trace elements, especially heavy metal elements in river water will provide thegrounds for the assessment of the influence of human activities on the environment. At present, the stud- ies of water bodies in karst areas are focussed on the analysis of chemical compositions of surface and underground water samples, and almost no systematic study has been done on trace elements. So theauthors have carried out systematic studies on the distribution of concentrations of the dissolved trace elements and their controlling factors, while some systematic studies are under way on the major compositionsof river water in the Wujiang drainage system in Guizhou Province. On the basis of the characteristics ofthe U-Ca-Sr system in river water and their geochemical indicating implications (Refer to the paper entitled “The hydrogeochemistry of the Wujiang River drainage system in Guizhou, China: I. The U-Ca-Srsystem in karst river water”), the paper is concerned mainly with the trace element composition of river GEOCHEMICAL studies of trace elements, especially heavy metal elements in river water will provide the grounds for the assessment of the influence of human activities on the environment. At present, the stud- ies of water bodies in karst areas are focussed on the analysis of chemical compositions of the surface and underground water samples, and almost no systematic study has been done on trace elements. So the authors have carried out systematic studies on the distribution of concentrations of concentrations of trace elements and their controlling factors, while some systematic studies are under way on the major compositions of river water in the Wujiang drainage system in Guizhou Province. On the basis of the characteristics of the U-Ca-Sr system in river water and their geochemical indicating implications (refer to the paper entitled “The hydrogeochemistry of the Wujiang River drainage system in Guizhou, China: I. The U-Ca-Srsystem in karst river water ”), the paper is concerned mainly with th e trace element composition of river