This paper describes the application technology of inverter technology,a large temperature difference technology and condenser selec-tion in energy-saving of water system of refrigeration air conditioner,the mechanism and energy-saving about these three energy-saving methods were carried out,the results show that they can achieve the purpose of energy-saving to some extent,which has great significance for energy-sav-ing in refrigeration air conditioner water systems.%介绍了变频技术、大温差技术及冷凝器的选择等在制冷空调水系统中节能环保的应用技术，并分别对各节能方式进行了机理和节能分析，分析结果表明三种节能方式在一定程度上都可以达到节能环保的目的，对制冷空调水系统的节能具有重要的意义。
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