Abstract: The geothermal anomaly characteristics at Wudongde hydropower station dam site refer to the Reshuitang fault and the geological environment of underground engineering, so the special geological investigation and analysis were carried out. The results show that：geothermal anomaly is associated with the Reshuitang fault, but it was not the evidence for the Reshuitang fault activities; the hot spring distributed along the fault is classified as medium-low temperature type. The formation of those hot springs attributed to the special topography and geological structure, and the cause of those hot springs stratum-fault compound control mode. The Reshuitang fault is not a active fault, would not affect the adjacent dam site. Springs developed along faults are related with geothermal anomaly in adjacent areas will bring adverse impact on underground engineering construction. So, it should take appropriate engineering measures to ensure safety in the construction process.