Abstract: The employment flow of migrant workers is an important way to narrow the gap between urban and rural areas and achieve common prosperity. Based on the dynamic monitoring survey data of the national floating population in 2017, the impact of social basic medical insurance on the employment flow of migrant workers was studied. The study found that compared with the medical insurance for employees, the resident medical insurance reduced the migrant workers' flow time; Residents' medical insurance promotes the probability of more than three times of mobility; Compared with the resident medical insurance, the employee medical insurance promotes the cross-city and cross-county flow of migrant workers. The heterogeneity results show that the resident medical insurance weakens the cross-city and cross-county flow of the old generation of migrant workers, while the employee medical insurance promotes the cross-city flow of the new generation of migrant workers; Participating in residents' medical insurance or workers' medical insurance in registered residence will have a "pull back" effect on migrant workers' employment mobility. Therefore, in order to promote the employment flow of migrant workers and weaken the restraining role of social basic medical insurance in the process of migration, we should create conditions to encourage more migrant workers to participate in employee medical insurance; Improve the overall level of medical insurance and reduce the transfer and continuity barriers of medical insurance.

Key words: migrant workers, resident basic medical insurance, employee basic health insurance, employment flow