Objective To understand the changes of the coverage of medical insurance and the utilization of medical services from 2000 to 2009.Methods The data on medical insurance and utilization of medical services were obtained from China Nutrition Panel Survey conducted by University of North Carolina,Chapel Hill.The trend of medical insurance and use of preventative medical services were examined.And a Logistic regression model was used to estimate the relationship between some social economic status and the enrollment of medical insurance and use of medical services.Results The coverage of medical insurance expanded dramatically from 20％ in 2000 to 89％ in 2009.The rural population experienced higher expansion.The gap between rural and urban populations in terms of insurance coverage was closed.The use of preventive services remained low in both rural and urban populations,with 3.72％ and 4.62％ respectively.Conclusions Both coverage of medical insurance and use of prevention medical services imoroved from 2000 to 2009,which has provided solid foundation for further reforms.