The linguistic meaning of "imagination" in geographical imagination can date back to the classic Greece. It is gradually permeated into geographical discipline from philosophy, psychology, literature, arts and sociology etc. Sociological imagination is the agent to directly stimulate geographical imagination. The application range of geographical imagination is limited in present foreign area, past native area and past foreign area. The study on geographical imagination consists of four parts: geographic reality, geographic imagination, geographical imagination and imagined geography, which are respectively four philosophical sectors: phenomenon, mental perception, recognition and description. Of geographical imagination, the term "imagination" has multi-meanings such as thought, analysis, inquiry, critique, discovery, ideas, vision, design, conceit, etc. which is the general term of imagination (imaginary, imaginative), imagine (imagining, imagined), image and imagery. In the aspects of the theory and method, "geographical imagination" includes the methods of historical narration analysis in traditional geography, scientific positivism in modern geography, and humanism in contemporary geography. What is known as the term "imagination" is "study" or "research". What is known as "geographical imagination" is really geographical research combined with scientific enlightenment in recent antiquity, scientific positivism in modern times, and humanity concerning in post-modern times.