Forty-four surface water samples were collected in Baihua Lake, Guizhou Province.The different species of mercury and water quality parameters, such as reactive mercury, dissolved mercury, particulate mercury, were tested.The spatial variability of different species of mercury in the surface water of Baihua Lake were studied based on the mathematical statistics and Geostatistics methods (Kriging).On the basis of the models of semivariance fitness, we used ArcGIS software to proceed Kriging interpolator to reveal the distribution patterns of different species of mercuiy in the surface water of Baihua Lake.The results indicate that mercury contamination in the surface water of Baihua Lake is due to headwaters, then mercury contents will decrease with the direction of flowing water.But in the region of eutrophication, the contents of particulate mercury and total mercury increase.