there are many papers studying on the employment differences between urban and migrant workers,the general view is that the informal employment is the mark of the migrant workers' disadvantage in employment. This conclusion ignores the difference of the urban and migrant workers under the same background of employment market. This paper,using the random effect model of panel data,analyzed the differences between urban and migrant workers in the labor market selection and the wage mechanism under the same background of market. The results indicate migrant workers not only more fill the informal post,but also their employment is far worse than urban workers even in the same market background (informal market). Thus,informal employment is not all performance of migrant workers' disadvantages in employment; the labor market segmentation (informal employment as a key word) is also not all system root of their disadvantage in employment. In other words,even broken the labor market segmentation,urban-rural difference in employment will not disappear.
