This paper discusses mainly the definition of environmental geology and geological environment and their relationship to relevant subjects, and expounds the position of geological environment in the whole natural environment of mankind and the importance of protecting geological environment in overall environmental protection. The paper emphasizes that the central task of protecting geological environment is preventing and controlling geological hazards and the basic way to prevent and control geological hazards is operating along the opposite direction of their formation. It is necessary to strengthen the forecast of geological hazards and to establish a scientific appraisal system for geological environmental quality and capacity.