Objective To observe the clinical effect of traditional Chinese medicine three grass soup fumigation treatment of pediatric allergic purpura. Methods 120 cases of allergic purpura were randomly divided into treatment group and control group. The treatment group were treated with western routine therapy and traditional Chinese medicine fumigation treatment，control group mainly to Chinese and Western conventional treatment. Results the total effective rate of treatment group was 96. 7%，control group，the total efficiency of 85%，the treatment group was superior to the control group in improving symptoms onset time. Conclusion three grass soup significantly fumigation treatment of children allergic purpura curative effect，in particular，has significant effects on the aspects of the rash subsided，alleviate pain in joints，and use the method is simple and convenient，worthy of clinical application.