The geothermal resource is a clean complex resource, which can be changed into sustainable energy if there are scientific and technological guarantees. This paper, taking the heating engineering in a processing zone in Tianjin for example, explores the sustainable utilization of geothermal resources that is used as heat source for basic heating load, introduces the dynamic prediction technologies of the production-reinjection of geothermal wells, the design of geothermal wells, the technologies of cascaded utilization of geothermal resources, and the project appraisal. The practice proves that the sustainable utilization of geothermal resource will result in good economic and social benefits.