Objectives To investigate the prevalence of hypertension and its primary risk factors in patients with dilated cardiomyopathy (DCM). Methods Three hundred and sixty-two patients with DCM(DCM group)and 401 age-matched residents (control group) were enrolled randomly in the study, the hypertensive prevalence rate were calculated respectively in the two groups and were compared with each other; the patients in the DCM group were divided into two subgroups (hypertension subgroup and non-hypertension subgroup) according to whether the patients have hypertension; the clinical data related to blood pressure was compared between the two subgroups. Results The prevalence of hypertension in DCM group was significantly higher than that in the control group (32.8% vs. 20.1%, P<0.01); There were no significant differences on the age, gender, occupation and left ventricular ejection fraction (LVEF) between the two subgroups, but the mean heart rate and the percentage of patients who had family history of hypertension were significantly higher in the hypertension subgroup than that in the non-hypertension subgroup (P<0.05 and P<0.01). Conclusions The prevalence of hypertension in patients with DCM was high; The increased activity of sympathetic nervous system and the hypertensive genetic factor may be the main risk factors of hypertension in patients with DCM. Objectives To investigate the prevalence of hypertension and its primary risk factors in patients with dilated cardiomyopathy (DCM). Methods Three hundred and sixty-two patients with DCM (DCM group) and 401 age-matched residents (control group) were enrolled randomly in the study, the hypertensive prevalence rates were calculated respectively in the two groups and were compared with each other; the patients in the DCM groups were divided into two subgroups (hypertension subgroup and non-hypertension subgroup) according the whether the patients have hypertension; the clinical Results The prevalence of hypertension in DCM group was significantly higher than that in the control group (32.8% vs. 20.1%, P <0.01); There were no significant differences on the age , gender, occupation and left ventricular ejection fraction (LVEF) between the two subgroups, but the mean heart rate and the percentage of patients who had family histo ry of hypertension were significantly higher in the hypertension subgroup than that in the non-hypertension subgroup (P <0.05 and P <0.01). Conclusions The prevalence of hypertension in patients with DCM was high; The increased activity of sympathetic nervous system and the hypertensive genetic factor may be the main risk factors of hypertension in patients with DCM.