The deep cold water in reservoir is an ideal nature cold source for the air conditioning system of the underground hydropower plant. It can reduce the energy consumption of the ventilation and air conditioning system. This paper summarized the calculation methods of the water temperature in reservoir and analyzed the applicable of the calculation methods of the water temperature in different reservoirs. By analyzing the features and requirements of the technical water supply system, this paper found that combining the cooling water of the air conditioning systems with technical water-supply system in underground hydropower plant is feasible, because the water temperature, water quality, water quantity of the technical water supply meet the requirements of the water of the air conditioning systems. The combining the water of the air conditioning systems with technical water supply system can reduce the human, material and financial resources consumption which is due to the individually setting of water intake for air conditioning systems.%水库深层低温水作为地下式水电站厂房空调系统的天然冷源，可以显著减少通风空调系统能耗。对水库水温的计算方法进行了概述，分析了不同水库条件下水温计算公式的合理选用问题；同时结合水电站技术供水系统的特点及要求，分析了地下式水电站厂房内的技术供水与空调系统冷却用水合用的可行性，结果发现地下式水电站厂房内的技术供水在水温、水质、水量方面都满足空调系统冷却用水的要求，二者合用将减少单独为空调系统设立取水系统带来的人力、物力以及财力的消耗。
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