Abstract: The concept and operating principle of the underground water source heat pump air conditioning system is introduced，and the conditions of the geographic environment，geology and water source and the feasibility of water source heat pump are analyzed in Xingshan Iron Mine.Then，the component of the water source heat pump air-conditioning system is described and its economic benefit brought is analyzed.Based on the practical operating condition and energy saving analysis of the above system in Xingshan Iron Mine，its advantages are summarized.

Key words: Underground water source heat pump, Extreme temperature, Automatic control system, PLC, Energy efficiency ratio