The basic medical insurance participation of migrants has been a weak but important link in the universal health insurance system. Based on the data of the China Migrants Dynamic Survey in 2011, 2013 and 2018, this paper examines the basic situation and trend of basic medical insurance participation of migrants in China. The results show that the basic medical insurance participation rate of migrants in China has increased rapidly in recent years, reaching 93.5 % in 2018, but is still slightly lower than the national average of 95%. Although the migrants with the characteristics of woman, low education and low income has been in a disadvantageous position in basic medical insurance participation, their insurance participation has been significantly improved in recent years. Based on analyses above, this paper puts forward some countermeasures and suggestions to improve the basic medical insurance for migrants.