Objective To explore the law and characteristic of TCM syndrome type of nasopharyngeal carcinoma after radiotherapy.Methods The methods of clinical epidemiology were used in the enrollment of 94 cases. Their information of clinical TCM syndromes was collected. The syndrome information database was established for the cluster analysis on the diagnostic indices and the correlated factor analysis on the TCM syndrome types of nasopharyngeal carcinoma after radiotherapy.Results With the cluster analysis

there were 6 TCM syndrome types of nasopharyngeal carcinoma after radiotherapy achieved. There was not significant difference in the occupying percentage of TCM syndromes in different age stages （P>0.05）. In the different time periods after radiotherapy

there was significant difference in the distribution of syndromes of yin-deficiency of the lung and stomach

yin-deficiency of the kidney

and weakness of the spleen and stomach （P<0.05）. With the different radiotherapy methods adopted

there was significant difference in the distribution of syndromes of yin-deficiency of the lung and stomach and weakness of the spleen and stomach （P<0.05）.Conclusion After radiotherapy

there exist 6 TCM syndrome types of nasopharyngeal carcinoma

including the injury of yin by evil heat toxins

weakness of the spleen and stomach

phlegm and heat in combination

yin-deficiency of the lung and stomach

yin-deficiency of the kidney

and phlegm and blood stasis in combination

the distribution of which is related with the different time periods after radiotherapy and the different radiotherapy methods.