Objective:To observe the effect of Dabuyinwan on thymus pathological changes of experimental hyperthyroid rats. Methods:Hyperthyroid rats were induced by Euthyrox given orally everyday for three weeks. Then the effect of Dabuyinwan on thymus pathological changes was observed. Results:The thymus thickness, cells numbers, density increased significantly in low,middle and large dosgage of Dabuyinwan groups. Reticular cells scattered and matured, small vessels congestived obviously, there were thymic corpuscles. The groups of high dose Dabuyinwa...