Objective To study Chinese medical pattern classification and characteristic of viral myocarditis （VM）.Methods Database was established by dynamic observation on 201 cases of VM. Chinese medical pattern of VM was analyzed by data-mining methods such as frequency statistics

cluster analysis and crosstabs analysis.Results VM had 8 kinds of Chinese medical pattern. Evil toxin invading the heart pattern occurred most frequently at acute stage and its cardinal symptoms were febris

cough

pharyngalgia

diarrhea

cardiopalmus

yellow tongue fur and rapid pulse. Great qi fall pattern occurred most frequently at lag or chronic stage and its cardinal symptoms were short breath

tension in the throat

sagging distention in the chest

lassitude

white tongue fur and bound and intermittent pulse. Phlegm obstructing heart network vessels pattern occurred most frequently at lag or chronic stage and its cardinal symptoms were chest distress

nausea and vomitting

dark red tongue

thick slimy tongue fur and slippery pulse. Heart and spleen deficiency pattern occurred most frequently at lag or chronic stage and its cardinal symptoms were cardiopalmus

short breath

insomnia

dreaminess

anorexia

lassitude

diarrhea

pale tongue and white tongue fur. Qi and yin deficiency pattern occurred most frequently at acute

lag or chronic stage and its cardinal symptoms were short breath

lassitude

insomnia

dreaminess

night sweat

peeling tongue fur and fine rapid pulse. Heart blood stasis obstruction pattern occurred most frequently at chronic stage and its cardinal symptoms were precordialgia

purple or dark red tongue and stringlike pulse. Effulgent yin deficiency fire pattern occurred most frequently at lag stage and its cardinal symptoms were cardiopalmus

upset

insomnia

dreaminess

feverish palms and soles

night sweat

peeling tongue fur and fine rapid pulse. Yin and yang deficiency pattern occurred most frequently at chronic stage and its cardinal symptoms were cardiopalmus

serious short breath

bloat

purple or dark purple tongue and deep slow or bound and intermittent pulse.Conclusion Cluster analysis is scientific

pragmatic and credible for study on Chinese medical pattern classification and characteristic.