This paper uses statistical and double wells power methods to estimate their geothermal resource of ten geothermal fields in Beijing and re-estimate their geothermal potential. The heatinfluencing range of double pumping-filling wells is 360k square meters at their space of 300m, which can hold 2.28 double pumping-filling units per square kilometer. The available heating potential will be 275 million square meters by statistical method, in Beijing’s ten geothermal fields under above conditions, and 301 million square meters by double wells power method. It could be up to 860 million square meters if geothermal graded using combined with other clean energy aids. Heating supply by using double wells system can increase well distribution density, helpful to promote the development of geothermal heating in Beijing, and in China.