1.Main science and technology connotation and significance Geothermal energy includes that from shallow stratum and that from deep stratum.Shallow geothermal energy refers to the low-temperature heat contained in the soil,gravel,and groundwater within several hundred meters below the earth’s surface[1].Under current technological and economic conditions,this energy can be fully developed 1.Main science and technology connotation and significance Geothermal energy includes that from shallow stratum and that from deep stratum. Shallow geothermal energy refers to the low-temperature heat contained in the soil, gravel, and groundwater within several hundred meters below the earth’s surface [ 1] .Under current technological and economic conditions, this energy can be fully developed