Starting with the history and present situation of urban land expansion. According to data in city statistic, data in investigation of some city plan and implementation procedure in XinJiang, On the basis of qualitative analysis, I made some initial quantitative analysis and theoretic research on effect of economic development on urban land expansion. Theoretical analysis was made towards urban land expansion in accordance with economic methods. On the basis of fuzzy classification, some qualitative analysis and quantitative analysis was made on the relationship between urban land and output value .On the basis of these, II posed the advice on how to determine the scale of urban in urban planning.
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