Abstract: The groundwater temperature field shows some abnormal phenomena due to special topographic and geormrphic conditions and geologic characteristics in canyon areas.Taking groundwater temperature field in canyon areas at Xiluodu hydroplant as an example,the groundwater temperature field is analyzed systematically through the numerical simulation,the analogy and the regression analysis method.And then,the abnormal mechanism of groundwater temperature field in canyon areas is discussed.From the examples analysis,it is concluded that as region groundwater flow in deep circulation is warmed through deep parts,the abnormity of the groundwater temperature in Xiluodu canyon areas is normal phenomena displayed in drainage region.It is not made by active tectonics.Therefore,the dam location selected in here is feasible.