Our township enterprise , which mainly consists of medium sized and small enterprises , have achieved great progress in export of commodity and in overseas operation since the reform and opening which took place over 20 years ago , furthermore they have become an important growing point and are also playing a considerable role in export business of our country 改革开放20多年来，作为我国中小企业主体的乡镇企业在商品出口、海外经营上取得明显的成绩，已成为我国外贸出口的重要增长点和生力军。乡镇企业在积极引进外资、技术和稳定增加出口能力的同时，也引导一批有实力的乡镇企业走出国门，经商办企业，开展跨国经营。
Through quantitative analysis , we reached the conclusions : the difference in the three belts is obvious but not fearful ; besides of historical basis and natural condition , the factors that lead to the difference consist of input intensity ( specially foreign direct investment ) , exports power and economical system ( structure of possession system ) . industrial structure and social - cultural elements have some influences 通过定量计算得出结论:三大地带之间的差距虽然明显，但不可怕；造成三大地带经济增长差异的原因，除了历史基础和自然条件以外，首先是投入强度(尤其是人均外商直接投资额) ，其次是出口能力和经济体制(所有制结构) ，产业结构和社会文化因素也有一定影响。
