Objective To observe the application effect of wuhuangyou in the prevention of radiodermatitis for tumor patients undergoing chemotherapy and evaluate its applicability. Methods We divided 203 tumor patients undergoing chemotherapy into 3 groups.Application of wuhuangyou,meibao and routine health education were used in each group. Results Statistical difference existed in the incidence rate and degree of radio-dermatitis between the three groups,among which wuhuangyou proved to possess the best effect,P ＜ 0.01. Conclusion The application of wuhuangyou was safe,effective,economical in the prevention of radio-dermatitis.It could relieve the pain of patients and guarantee the smooth process of chemotherapy.