The Study Of City Moderate Population Upon The Background Of Sustainable Development

With city population increasing rapidly during urbanization process which resulted in environmental degradation, people payed more attention to the sustainable development.and the moderate population upon city economy and resources also became a major concerning issue.Based on the respect of sustailable development,the article chose three systems including population,economy and resources as study objects,and analyzed economic moderate population, resource moderate population and comprehensive moderate population of Chengdu from the macro point.at last,it put forward some policy recommendations for the future popution development strategy of Chengdu according to the research results.The article combined multi-disciplinary knowledge including demography, heconomics, environmental studies and so on, analyzed moderate population scale of Chengdu through applying variaty methods such as literature analysis, empirical analysis, comparative analysis, descriptive analysis etc. The results showed that:First, from the results of economy moderate population, resource moderate population and comprehensive moderate population, during2001to2009, Chengdu Economic population supporting capacity was higher than the national average, and moderate population was higher than the actual population scale; resource population supporting capacity was lower than the national average, and resource moderate population scale was very low, whose overloaded population scale kept a high level in the last nine years from655.65ten thousand in2001rising to781,54ten thousand in2009,so resource supporting capacity bored a lot of pressure; comprehensive moderate population was in overload conditions because of being affected by resources.Second, from the results of moderate population scale based on three economic indicators,we got that Chengdu’s economic growth and industrialization process was higher than the national average, and there was still surplus population supporting space upon the two indicators, but the surplus space was being decreased gradually; the employment situation in Chengdu was not so good as the national average, but has improved gradually.Upon the employment indicator, the urban population supporting scale has exceeded the actual population,and the surplus space was rising year by year.Third, from the results of moderate population scale based on two resource indicators,we got that Chengdu’s moderate population scale was much lower than the actual population upon the land and water resources.Among the five indicators,water resource overloaded the most population,up to789.52ten thousand in2006.the second one was land resource,also up to772.67ten thousand in2009.In response to the above results.the article proposed future population development strategy of Chengdu. First, to maintain economic population supporting capacity; Second, to enhance the resource supporting capacity; Third, adhere to the coordinated development of population, economy and resources.