The traditional shift-share method can quantify the changes in economic geography of regional economic growth, but it ignores the interactions within the space region. The spatial expansion model relying on the traditional model can make up for the defect, because it can reflect the role of close relationships about the regional industrial structures. Appling the spatial expansion model to the six provinces of central China and comparing with the traditional shift-share method, we can find out that, if the competition component difference is positive, it indicates that the neighborhoods increase the competitiveness of that industry, if not, it means that it hinders the enhancement of the competitiveness of the industry, and so on.