Objective:To observe effects of Naoxintong Capsules on left ventricular weight and functional characteristics in the patient of metabolic syndrome（MS）.Methods:Left ventricular structures and function were detected with Duppler ultrasonic examination.Sixty cases of MS were divided into MS group（without hypertension） and hypertesion MS （HMS） group（with hypertension） and left ventricular structures and functions were compared between groups.Effects of Naoxintong Capsules on left ventricular hypertrophy and function in the HMS group were investigated.Results:Compared with MS group and the control group

thickness of the left ventricular posterior wall

thickness of the interventricular septum and left ventricular weight significantly increased

and E/A value significantly decreased （P<0.01） in the HMS group.There were significant differences in left ventricular weight and E/A in the HMS group（P<0.01） before and after treatment.Conclusion:Most MS patients have changes of left ventricular structures and functions

and Naoxintong Capsules can alleviate and reverse left ventricular hypertrophy

so as to improve function of the heart.