Objective To observe the adverse reactions of acute stage and late stage in nasopharyngeal carcinoma patients after radiotherapy.Methods 89 patients were investigated in the outpatient department by form.The median follow-up time was 3 years (2-23 years).Results In the acute stage,the ratios of serious xerostomia [78.7 ％(70/89)],the ear reaction [66.3 ％ (59/89)] and nose impairment [64.0 ％ (57/89)] were very high.In the late stage 79.8 ％ (71/89) patients developed radioactive tympanitis,in which 53.9 ％ (48/89) patients induced hearing loss,42.7 ％ (38/89) patients developed dry nose or nasal excessive discharge.The rate of serious xerostomia was 11.2 ％ (10/89),66.3 ％(59/89) patients suffered from superficial and more serious caries.Conclusion The rates of the radioactive tympanitis and caries stayed high in the late stage of nasopharyngeal carcinoma patients after radiotherapy.Concurreut chemoradiotherapy is probable to increase or aggravate the incidence of adverse reactions in the acute stage,but don’t show an effect on the late stage reaction.