Geo-spatial information science and technology is one of the most emerging fields of the progress of science and technology. With the Earth System as an important target, the development and integration of Remote Sensing, Geographical Information System, Satellite positioning and computernetwork are providing an unique means for studying our Earth, especially for studying the harmony of between human and nature, the coordination among population, resources and environment as well as societal sustainable development. Based on the analysis of the development of spatial remote sensing information technology, the features of spatial information and its development, the relation between the earth observation and the human impact was analysed and also the strategic consideration of development of earth observing system as well as geospatial information technology in China was proposed.