This study on the conception of Pyo Bon expressed in Hwang Jae Nai Kyung was summarized as follows: 1. The conception of Pyo Bon in the Yi Jung Byun Gi Lon(移精變氣論) and Tang Eak Yo Le Lon(湯液료醴論) of So Moon(素問) is that Pyo means the doctor and Bon means the disease. The Pyo Bon of this chapter has a meaning of time, namely first and last. 2. The conception of Pyo Bon in the Soo Yul Hyul Lon(水熱穴論) of So Moon is that Pyo means the lung and Bon means the kidney. The Pyo Bon of this chapter has a meaning of space, namely the upper and lower sides. 3. The conception of Pyo Bon in the Pyo Bon Byung Jun Lon(標本病傳論) of So Moon is that Pyo means a earlier disease and Bon means a later disease. The Pyo Bon of this chapter has a meaning of time, namely first and last. 4. The conception of Pyo Bon in the Chun Won Gi Dae Lon(天元紀大論), Yug Mi Ji Dae Lon(六微旨大論) and Ji Jin Yo Dae Lon(至眞要大論) of So Moon is that Pyo means a Yug Gi(六氣), namely wind, cold, heat, dampness, dryness, fire and Bon means a Sam Eum Sam Yang(三陰三陽), The Pyo Bon of this chapter includes a meaning of time and space. 5. The conception of Pyo Bon in the Sa Jun(師傳) of Yung Chu(靈樞) is that Pyo means a inside of the body and Bon means a outside of the body. The Pyo Bon of this chapter a meaning of space, namely the inside and outside. 6. The conception of Pyo Bon in the Wi Gi(衛氣) of Yung Chu is that Pyo means the end of limbs and Bon means the part of head, face, chest, abdomen, back. The Pyo Bon of this chapter has a meaning of space, namely center and circumference.