Abstract: The engineering thermal and humid condition has been investigated to find out the basic reason of heat hazard at Sanshandao Gold Mine. According to the field investigation result of thermal circumstance，the position of surveying surrounding rockmass temperature is designed. Through the temperature curve regression at corresponding location of different middles，the normal surrounding rock temperature gradient is obtained as 2.2×10^-2℃/m，and the geothermal gradient at underground geothermal area is 2.6×10^-2℃/m. According to the analysis of different thermal resources，rockmass heat dissipation，equipment，air compression and geothermal resource are the main reasons leading to the temperature increasing at Sanshandao Gold Mine. The research provides a basic data for heat hazard analysis and its governance.

Key words: Gold mine, Temperature gradient, Surrounding rock-mass heat dissipation, Engineering thermal circumstance