This paper attempts to dig reasons behind industry isomorphism-and explains that industry isomorphism has positive meaning to regional economy integration in the area of Changjiang delta.

• 长三角地区的产业同构和重复建设客观上形成了广域的产业集聚和规模经济,并未对长三角经济造成明显的不利,正是这种逐渐趋同的产业结构进一步促进了地区经济的发展。