Abstract: Based on the survey data of floating population in the Pearl River Delta urban agglomeration, a multi-dimensional index system is constructed to measure and analyze the citizenization level of floating population and its influencing factors, so as to provide reference for the formulation of citizenization policies of urban agglomerations. The results show that: (1) the overall citizenization level of floating population in first-tier cities is higher than that in second-tier cities. In terms of economy and identity, the citizenization level of floating population in first-tier ci-ties is higher than that in second-tier cities, but in terms of family and society, the citizenization level of floating population in second-tier cities is higher than that in first-tier cities. (2) The citizenization level of the floating population is affected by multiple factors. The citizenization level of the floating population, who were born after 1980, with higher education, from within the province and married, is higher than that of the corresponding control group. The level of economic citizenization of males is higher than that of females, but the level of family citizenization is lower than that of females. The longer the time they spent outside the city, the higher the level of citizenization of floating population, but the lower the level of social and family citizenization. Owning farmland and homestead reduces the citizenization level of floating population.