Industrial regions form an important part of the state economic region system and are the most basic units of production territory in the combination system of industrial production territory. They are the results of the concentration of industrial productive forces caused by the interaction of various factors on each other within a certain geographic range. The formingof industrial regions nevertheless is related to the fact that the development of industries within a range of territory of certain scale enjoys the priority.Based on the size of territorial scope and the characteristics of the system of production territory formed in fact, industrial regions can be defined in the following 3 grade types: (1) industrial regions of Grade One (great industrial zones); (2) industrial regions of Grade Two (main industrial districts); (3) industrial regions of Grade Three (basic industrial districts). Industrial regions of different grade types possess respectively different structure features.Industrial regions are the system of grades with multiple types and levels, within whichthe regions of the lower level form part of the higher level while the regions of the higher level are based on those of the lower level. Both the regions of the higher level and those of the lower level have very close internal links with each other during the process of industrial development.Industrial regions, when being constructed, not only should have their own regional characteristics but meanwhile should have a reasonable structure of production. In order to achieve this, the enterprises within the industrial regions must be reasonably combined.