Abstract: Solar geothermal heating technology used in sunlight greenhouse is the application of solar concentrator heating medium water，soil temperature is heated by circulating medium water，so as to provide the appropriate soil temperature for sunlight greenhouse crop growth. Solar geothermal heating system used in sunlight greenhouse with energy storage tank was designed and researched，and its effects were tested in Jinghai county of Tianjin city.Results showed that the system could effectively improve the soil temperature of sunlight greenhouse，the soil temperature could be maintained at 15 ℃ in winter，it was to meet the demand of fruit vegetables production.