For the study on occurrence of backache related to types of daily activities in adulthood Nine hundred twenty six adults living in Seoul were randomly selected as subjects from the eight kinds of occupation; housewives, teachers, nurses, officers, physicians, labourers, beauticians & barbers, and students. The purpose of this study was to identify various factors related to backache in daily activities and to apply these factors in clinical situations as well as in the community situations. This survey was conducted from September 21 through October 8, 1976. Under the ten hypothesis designed for this study, the followings were obtained; 1. Significant difference on occurrence of backache was revealed according to sex difference at 0.5% level. (x2 = 27.85, df= 1, p<0.005) 2. Significant difference on occurrence of backache was revealed according to age groups at 2.5% level. (x2 = 11.13, df=3, p<0.025) 3. Significant difference on occurrence of backache was revealed according to types of occupation at 2.5% level. (x2 = 18.04, df=7, p<0.025) 4. Significant difference on occurrence of backache was revealed according to types of movement originated by hand during occupational activities at 1% level. (x2 = 14.23, df=4, p<0.01) 5. Significant difference on occurrence of backache was revealed according to types of movement of legs during occupational activities at 0.5% level, (x2 = 20.78, df=3, p<0.005) 6. No significant difference on occurrence of backache was revealed according to length of daily working hours. 7. Significant difference on occurrence of backache was revealed according to degree of exercises at 5% level. (x2 = 6.01, df = 2, p<0.05) 8. Significant difference on occurrence of backache was revealed according to sleeping posture at 1% level. (x2 = 9.61, df=2, p<0.01) 9. Significant difference on occurrence of backache was revealed according to ordinary pattern of mean posture scure at 0.5% level. (t = 4.27, df = 924, p<0.005) 10. Significant difference was revealed mean posture scores according to period of backache history at 0.5% level. (f-ratio = 3,73, df= 4,562 p<0.005)