This paper systematically researches the theoretical system of criminal geography, which includes the following theories. They are:①Geographical environmental determinism. The theory holds that geographical environment plays a determinant part in criminal behaviors.②Environmentalism. The theory stresses that environments play an important part in criminal behaviors. It includes phases of the moon and crime, phases of stars and crime, geographical factors and crime, topographies and crime, eclectic criminology school environmental theory. Phases of the moon and crime hold that criminal behaviors take place with the change of phases of the moon. Phases of stars and crime holds that human criminal behaviors occur with distribution and movement of constellation and production and disappearance of celestial bodies. Geographical factors and crime holds that the difference of criminals' quantity, type and specific property are caused by the difference of geographical environmental factors in different areas. Topography and crime holds that quantity and type of criminal behavior are closely related to topography. Eclectic criminology school of environmental theory looks on natural factors as a part of social factors, and stresses that social environmental factors play an important part in criminal behavior.③Theory of time and crime. The theory holds that criminal behaviors change with time. It stresses the change of time plays an important part in criminal behaviors.④Criminal concentric circle theory of Chicago school. It is a theory of researching criminal spatial distribution in cities.⑤Criminal behavioral theory. The theory considers:criminal behaviors=personality of criminals+scene before crime+social reaction.⑥Criminal location theory. It is a theory that researching social environment and community environment could influence the outcome and development of criminal behaviors. Through study on theoretical system of criminal geography, the authors just hope that this article is good for building and developing criminal geography.