In the complicated and changeable social environment, the mental health of citizens are affected by all kinds of unsafe factors. And as a part of the stress management, psychological crisis intervention is paid much attention by society. Crisis intervention cannot ignore the individual's environment and the interaction of the individual with environment. This paper reviews the crisis intervention's conception and theory, and explores the crisis intervention from the perspective of ecological system theory. The dynamic development processes of crisis intervention, namely prevention, early warning, crisis intervention, and late tracking, are discussed respectively. A case is presented in this paper. It gives us a more comprehensive and more systematic perspective to explore the crisis intervention, hoping it can be a useful reference for relevant professional staffs to establish psychological crisis intervention systems.