The objective was to clarify the characteristics of soil water geochemistry and the relationships between soil water and soil environmental factors in karst peak-cluster area. Soil water samples and soil samples were collected from the depths of 0~20cm and 20~40cm in each sampling site. And all samples were tested to meet groundwater testing standards and soil testing standards respectively. The methods of grey relational analysis (GRA) and canonical correspondence analysis (CCA) were employed to reveal the characteristics of soil water geochemistry and the relationships between soil water and soil environmental factors. The results revealed that geochemical properties of soil water and its corresponding geochemical indicators of soil were with different levels of spatial heterogeneity. And the variable coefficient of pH value was the smallest among the indicators, just ranging from 2.48% to 10.44%. Except Mg2+ and Cl-, the variation coefficients of soil water geochemistry were decreased with the increase of depth. The properties of soil water geochemistry in the depth of 20～40cm were more stable than that of 0～20cm. HCO-3, Ca2+ and SO2-4 were the main factors affecting the soil water geochemical characteristics, with HCO-3 as a leading role. Furthermore, the CCA results showed that the correlations between geochemical properties of soil water and soil environmental factors were different. Among the main soil environment factors influencing soil water geochemistry, the total potassium (TK), exchangeable magnesium (EMg), available zinc (AZn) and soil particles of 0.2～2mm and 0.002～0.02mm diameters influenced the Mg2+, HCO-3 and pH value of soil water;the available copper (ACu), humic acid (HA) and humin (HM) mainly impacted Na+ and K+ of soil water;rapidly available potassium (AK), soil water content and soil composed of particles of diameter less than 0.002mm, and influenced soil water geochemistry by Na+, K+, Cl-, SO2-4 and so on.