Abstract: In the course of social transfer from duality economy society to modern economy society in China, many rural surplus labor forces have entered into the cities and spontaneous settlement of the immigrants had appeared in the cities, which have a serious impact on the Chinese social and urban development. Through spot check and stress investigation of "urban non-nativeborn low-income migrants" in 50 villages in Guangzhou and Dongguang cities in Guangdong Province with visiting and questionnaire method, the thesis argued about below-up self-help housing and developing settlement model, which impact on urban development. And a below-up urbanization theory assumption happening in urban region was pointed out.