In the long term practice of geosaences, from the stage of focusing on single technology to focusing on both technology and economics, now human-beings is entering into a new stage: the sustainable development of technology,economics, and environment. Meanwhile, there is a complete revolution: the theory has developed from "human-centered"into"human-earth synergetic". Besides, the method of research has developed into the systematical, non-linear,and informative level. Just as the famous geologist-Mr. Huang binwei pointed out, "geosciences is the base of sustainable development strategy, the,of which is to harmonize the relationship between human-beings and the nature".According to the inherent property of geohazard, the article begins with the analysis of geo-environmental evolution and developing process, and then explores not only the geo-environmeiztal conditions but also the human engineering activities(i. e. the environmental geological problem)in the"human-earth-society-economics"system. The aim is to builda new correct guiding ideology on geohazard(including its prevention and control),gradually to harmonize the inner dilemma in the"human-earth-society-economics"system and to promote the sustainable development of the population, the society~and the environment in China.