Abstract: Based on the analysis of regional geological background，geological characteristics，hydro⁃ chemical characteristics and heat storage conditions of the geothermal resources in Ziwei district，Yinjiang County，Guizhou Province，the characteristics of the geothermal resources in the area were analyzed by means of nodule geophysical prospecting，drilling and laboratory tests.It is considered that the geothermal resources in this area are fracture convection type geothermal resources and the circulation of geothermal water in crustal rock mass is a very complicated circulation system.In the study area，atmospheric precipita⁃ tion，surface water and groundwater along the fault zone and voids in rock mass (fractures and caves，dis⁃ solve gap，karst pipeline，etc.) into underground migration channel infiltration，constantly in the process of infiltration migration for underground heat water temperature rising，and dissolve and leached in the sur⁃ rounding rock mineral composition，under the action of gravity is controlled by deep fracture do large cycle. The study results show that the geothermal water，which is mainly derived from rainfall，is heated by circu⁃ lation under the action of recent faults and karst fissures，and finally forms rich geothermal water resources in the research area.The wellhead water temperature is 49 °C，the water inrush water is 1 104.68 m³/d，and the water quality is SO₄—Ca—Mg type when the pressure reduction is 0.5 MPa (depth 50.0 m).

Key words: geothermal water, hydrochemical characteristics, genesis