Abstract: Objective To investigate the prevalence and influencing factors of overlapping coverage of basic medical insurance among migrant populations and to provide evidences for making strategies to prevent duplicated medical insurance application.Methods Using probability-proportional-to-size sampling (PPS),198795 migrant persons were selected from the database of Dynamic Survey on Migrant Population in China-2013 and surveyed with a questionnaire.Results The rate of overlapping coverage of basic medical insurance was 10.9% among the participants.The results of univariate and multivariate logistic regression analysis demonstrated that the migrants aged 25-44 years,with the education of senior high school or above,employed by a Sino-joint venture company or a foreign-funded enterprise,with a rural residence registry,and migrating between provinces or cities were more likely to have duplicated basic medical insurance application (all P<0.05).Conclusion The main influencing factors for duplicated basic medical insurance application are the character of the employer,age,education background,the place of registered residence,and the geographic scope of migration among the migrant populations.