Objective: To observe the effect of Chinese herbal medicine on the salivary glands of patients with Nasopharyngeal cancer during radiotherapy (RT).Methods: Fifty cases with NPC were randomly divided into observation group treated with RT plus Chinese herbal Medicine and control group treated with RT alone.The symptom of patients,such as the severity of salivary glands damnification, the mouth reaction and qingze tongue was noted . And at the same time, the flow speed and amylase content of salivary, the rat...