Abstract: Objective Geographic information technology is evolving from a Geographic Information System to aGeographic Information Service,given the increasingly widespread use of the Internet.Not only aregeospatial data and information shared online,but also geospatial knowledge is disseminated via theInternet.Geosciences'rules,models,and processes can be registered to the web,and provided to va-rious users through geospatial knowledge web services based on the Internet.In this paper,the back-ground for this transition from geospatial information to geospatial knowledge services is introduced,and key concepts of geospatial knowledge,geospatial knowledge services and the technologies are e-laborated.Finally based on this foundation,an implementation of a geospatial knowledge services isdiscussed.