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Objectives To evaluate the value of HRV analysis and multiple correlations for study of child virus myocarditis. Methods HRV analysis was performed on 41 myocarditis and 40 normal children. The HRV changes in waking and sleeping time were observed as well. Multiple correlation and regression were carried out with the depth of STT depression as dependent variable and all HRV time and frequency domain indexes including those in waking and sleeping time as independent variables.Results HRV abnormality was found in virus myocarditis children .Their HRV indexes were decreased no matter waking time or sleeping time and the differences between waking and sleeping time were much less than those in the controls. In multiple correlation and regression analysis, the ST depression correlated with VLF, LFN, LF. Conclusions HRV abnormalities existed in children with virus myocarditis which indicates the sympathetic tense were increased ermanently. The ST depression correlates with VLF,LFN, LF. HRV analysis is helpful with the study and its diagnosis of utonomic function in children with virus myocarditis.