Abstract: Water samples taken from 4 geothermal wells and 3 hot springs in the Kangding geothermal fields are examined in this paper. The scaling trend of the thermal groundwater is calculated and judged with the methods of Ryzner’s index and Larson’s index, the WATCH program and the Na-K-Mg equilibrium diagram. The results show that thermal groundwater in part of the geothermal wells and hot springs in the Kangding areas has a tendency to scale. The main precipitated scaling matter is CaCO3, and chrysotile, calcite and talc are responsible for the scaling.