With the booming development over the past years, geo-parks have achieved impressive progress together with a series of problems. Most importantly, geological tourism is not in prosperity. How to prosper geological tourism and achieve the sustainable development of geo-parks is the top concern of workers engaged in tourism geology in China. This article discusses the problem from the perspective of core competitiveness of geo-parks, particularly from three aspects of subject, object and medium, and puts forward methods to form the core competitiveness.