Summary: A multi-sector dynamic model in which quantity and each sector’s share in the investment are decided by finance sector is developed to analyze economic structure unbalancing and economy regression reduced by such an unbalancing. The model shows how a short-eye investment can result in economic structure unbalancing and then regression in economy. It also points out that the economy will be easier to slump under such structure unbalancing, for the whole economy system is changed to be vulnerable to outside impacts.