[Objective] To study the relation between essential hypertension(EH) and TCM syndrome types and Plasma homocysteine(Hcy)and lipid.[Method]343 cases of essential hypertension were divided into following syndromes:Liver-fire hyperactivity,hyperactivity of Yang due to Yin deficiency,deficiency of Yin and Yang,Qi-deficiency and stagnation of phlegm.Plasma homocysteine and lipid in the patients of EH and the normal persons were detected with Fluorescenoe Polarization Immunoassay(FPIA).[Result]Hcy level in the patients of EH was significantly higher than that of healthy controls(P