To study on the assignment of the eight trigrams (八卦) in human body being based on based the number of HADO(河圖)-NAGSEO(洛書). Being based on the number of HADO(河圖)-NAGSEO(洛書) and the BEOK-HEE's diagram of eight trigrams order(伏羲次序圖), human being organ (five-Jang organs (liver, heart, spleen, lung and kidney), five organs (ear, eye, mouth and nose), provisional namely six entera for the process on intake, digestion, excretion of food (mouth, stomach, small intestine, large intestine, rectum, anus) are assigned eight trigrams (八卦). Eight trigrams(八卦) are attached to the based on the number HADO(河圖)-NAGSEO(洛書): 1-GEON(乾), 2-TAE(兌), 3-LEE(離), 4-JIN(震), 9-SON(巽), 6-GAM(坎), 7-GAN(艮), 8-GON(坤). And (八卦) are attached to the human being organs (five-Jang organs (live, heart, spleen, lung and kidney), five organs (ear, eye, mouth, nose, anus) : 1-GEON(乾)-left lung-left nose, 6-GAM(坎)-right kidney-right ear, 7-GAN(艮)-left heart-anus, 8-GON(坤)-right liver-right ear. Eight trigrams(八卦) are attached to the provisional namely six entera for the process on intake, digestion, excretion of food : the air(GEON 乾), the month(TAE 兌), the stomach(LEE 離), the small intestine(JIN 震), the large intestine(Son 巽), the rectum(GAM 坎), the anus(GAN 艮), the excrements(GON 坤). The BEOK-HEE's diagram of eight trigrams order(伏羲次序圖) means immutable order naturally. The process of the human being organs( five-Jang organs, five organs and six entera's digestion) is also unchangeable in region and program. Therefore we can set up the five-Jang organs, five organs and the process of six entera's digestion as the category of observation on the basis of BEOK-HEE's diagram of eight trigrams order(伏羲次序圖), and then we can arrange eight trigrams (八卦) on the five-Jang organs, five organs and the process of six entera's digestion.