Changing flood irrigation into drip irrigation in farmland production, saving water and reducing evaporation; There is an underground river in Turpan, Xinjiang to reduce evaporation. When pouring boiling water, it cools quickly in a large bowl of containers, and it also uses evaporation to dissipate heat. Salt is produced by evaporation in the western and eastern coastal areas, and crystals such as copper sulfate crystals are chemically precipitated by evaporation. Aquaculture has drainage and evaporation to clean the pond; Evaporation in the desert is very strong, so ancient mummies, silk and other precious cultural relics can be preserved.