From the aspect of space economic system,the economic development of the Yangtze asin has the following three interrelated basic features:(1)Space differences of the basin's economic development, referring to the space differences in the basis,speed and level of economic development among regions in the basin.(2)The space coincidence of the basin's economic development with natural conditions and resources.The effect of regional natural system on regional economic demonstrates itself in that the upper reaches are rich in resources,while the mid...