In 2019，the registered migrant population to Guangzhou City exceeded 9.673 million. The integration of the floating population is not only a critical priority of Guangzhou’s strategies of an international metropolitan but also an important factor concerning the sustainable development of Guangzhou’s economy. This paper assesses the degree of integration of the migrant population to Guangzhou，Shenzhen，Beijing，and Shanghai by establishing an indicator system. The comparison found that the migrant population to Guangzhou are mainly poorly educated. The low employment levels and difficulties in housing and children’s schooling，low social security，and less willingness to integrate are still the institutional barriers for migration to integrate. In response to such problems，the recommendations are as follows：（1）upgrading of the industrial structure and attracting more well-educated talents；（2）promoting the reform of the household registration system and breaking down institutional obstacles；（3）equalizing of basic public services，such as education，medical care；（4）emphasizing the cultural integration of the floating population and enhancing mutual understanding with local residents.