An increasingly evident trend in China’s urbanization is the“Urbanization of Poverty”． Migrant workers，especially those leaving both their farmland and hometown have become the main body of the new urban poverty population．Prior poverty studies focus more on“survival”but less on “development”and“risk”of the migrant workers．Based on the scarcity theory and the risk society theory，this paper puts forward a three dimensional framework of“Survival-Development-Risk”for poverty analysis．Empirical analysis using data of 2008 Floating Population Income Survey shows that the majority of impoverished migrant workers suffer from meager wage，hindered development，as well as lack of social insurance，and may easily fall into risky poverty．In addition，their subjective feeling of deprivation is also higher than the non-poor．This study also identifies variables，including gender，education level，job type，occupation and region，that have significant effects on poverty．