Abstract: Objective To investigate the epidemiologic feature of chronic disease of the people who applied for enterprise medical insurance in Dalian in 2004.Methods 13 000 people who applied for enterprise medical insurance were investigated by randomization,then assembled their clinical data and results of health examination,took the result into database,and did analysis by SPSS11.5 software.Results Hypertension had the max detection rate in the simple chronic disease,which detection rate was 37.82%.The detection rate of hypertension together with diabetes was 25.37%,and it was the max detection rate in multi-chronic disease.The prevalence of complication had significant deviation between diabetes and hypertension.Conclusion The detection rate of chronic disease and their complication was disparity in the people who applied for enterprise medical insurance.Precaution and manipulation work should be evolved by emphazing reference supply for enterprise medical insurance work in Dalian.