To evaluate the dynamic efficacy on TCM treatment for viral pneumonia，basing on the association between heat syndrome and phlegm syndrome.Methods:Association rules were used to observe the dynamic efficacy of treatment of 297 infantile Respiratory Syntactical Virus Pneumonia cases with the association between heat syndrome and phlegm syndrome.Results:The heat and phlegm syndrome of two groups were relieved day by day.However，the support degree comparison showed that the data of the study group were lower than that of the control group most of the time(2nd，3rd，5th，6th，7th or 3rd，5th day after treatment)，and the difference was marked(P<0.05).The symptoms of the study group disappeared 1~3days sooner than the control group.This illustrated that the significant efficacy of the study group on improving heat and phlegm associated pathogenesis.Conclusion:By using the association rules method，the clinical effect of TCM syndrome could be evaluated.Besides，this method lays the foundation of the exploration of the evaluation method for the clinical efficacy which is consistent with characteristics of TCM and follows the laws of TCM.