The meridian tropism of acupoints is an important academic way to recognize and deal with the relationship between acupoints and meridians in acupuncture medicine.The Huatuo Jiaji(EX-B 2)(Jiaji for short)acupoint family consisting of 34 points has long been considered to be an important extra-acupoint since the ancient times of China and is widely employed in clinical practice through continuous development in Chinese past generations.The present paper introduces 1)historical origin and development of EX-B 2

and 2)intercorrelation among the EX-B 2

spine and the Governor Vessel in anatomical positions.On the basis of these

we also discuss the possibility of that EX-B 2 is assigned to the Governor Vessel

its academic significance including common features and actions in physiological and pathological aspects and clinical significance in diagnosis and treatment of disorders.