Utilizing mean decomposition and quantile regression decomposition methods, this paper analyzes the market stratification and wage differentials among employed rural migrant workers, which are caused by some segmentation factors such as ownership, industry and region. Study found that proportion of wage discrimination revealed by above-mentioned factors within rural migrant workers exceeded more than these indicated by characteristics differentials such as human capital. Quantile regression decomposition shows that "glass ceiling effect" exists when wage differentials is caused by ownership or industry stratification, while regional wage disparities bring about "sticky floor effect". The former is related closely to inter-industry wage differentials as adjusting the economic structure, while the latter are inseparable with regional economic development gap, inter-regional differences in the minimum wage and the cumulative effects as selecting the employment area so on. Moreover, there is significant regional income gap for rural migrant workers working in the same ownership or industry, and the wages in the eastern is higher than these in the western. "Wage discrimination" within rural migrant workers only is another form in which urban society discriminates against the rural migrant workers.