Abstract: Scientific measurement of the poverty line of urban floating population is the premise and basis for formulating and modifying the relevant policies of urban poverty alleviation. Up to now, however, there has been few research on this topic in academia. This paper, based on the characteristics of this group's rights poverty, selects the extended linear expenditure system model to measure the relative poverty line of these urban dwellers from spending in food, health care, education, living routine and housing rental. The results, by employing CLDS, show that: the annual poverty line is 8281.350 RMB/person, the monthly line 690.113 RMB/person, and the poverty rate as high as 28.9%. To cope with that, we should first speed up the formulation of accurate identification standards; secondly, we should optimize the rights exchange environment and establish a social security system for social protection; finally, we should not only take the issue from a view of individual cities, but also from that of the whole country.

Key words: urban poor floating population, relative poverty line measurement, targeted poverty alleviation, extended linear expenditure system model