Objectives : The aim of this study was to show the rationale of point-selection on the methods of acupuncture and moxibustion in the Phlegm section(in the Naegyeong chapter) of the Donguibogam. Methods : First, We summarized the cause of each disease in the Phlegm section(in the Naegyeong chapter) of the Donguibogam. Then, We explained the rationale of acupuncture point-selection referring to the cause of disease, physiology of the Oriental medicine, other uses of each acupuncture points in the Donguibogam, character of each acupuncture points, flow of meridian pathways and specific acupuncture points etc. Results and Conclusions : Total 9 acupuncture points were used in the Phlegm section(in the Naegyeong chapter) of the Donguibogam. Most of acupuncture points were specific acupuncture points. But, some rationale of acupuncture point-selection were explained by the cause of disease, physiology of the Oriental medicine, other uses of each acupuncture points in the Donguibogam, flow of meridian pathways etc.