Objective:To observe clinical therapeutic effect of Jiedu Huayu Prescription on myocardial injury of viral myocarditis and effects on serum myocardial zymogram

superoxide dismutase（SOD）

malondialdehyde（MDA）

and natural killer cell（NK）.Methods:100 cases of viral myocarditis were randomly divided into a treatment group and a control group.The treatment group were treated with Jiedu Huayu Prescription

and the control with polarized liquid

vitamin C

coenzyme A

inosine

etc.14 days constitute one course.They were treated for 2 courses.Results:The total effective rate was 94.0% in the treatment group and 82.0% in the control group with a significant difference between the two groups（P<0.05）;The total effective rate for improvement of myocardial injury ST-T was 93.48% in the treatment group and 76.74% in the control group with a significant difference between the two groups（P<0.05）;Jiedu Huayu Prescription could significantly increase activity of SOD

decrease content of MDA（both P<0.01）.Conclusion:The therapeutic effect of Jiedu Huayu Prescription on myocardial injury of viral myocarditis is better than that of routine treatment of western medicine.