Introduction to Guoyu No. 1: Guoyu No. 1 originated from the Ordovician system of the Lower Paleozoic. The outlet temperature of Guoyu No. 1 geothermal well is 85°C. According to the temperature classification of the national standard GB11615-89, it is " "Hot water" grade, the water quality type is sodium chloride type water, so Guoda No. 1 geothermal water can be called "siliceous strontium carbonate hot water". This kind of mineral spring is very representative in North China.