Non-toxic goiter, such as single goiter and thyroid adenoma, not complicated with hyperthyroidism, is a common disease of endocrine system and often caused by psychic, environmental or genetic factors. Jiazhongfang is an experiential prescription of Professor Li Renxian for the treatment of goiter and shows good effect in clinic practice. In order to find out its modern mechanism of the prescription, in this research its clinic effectiveness was observed, and its effects on rat-model's thyroid fu...