A Study on environmental factors influencing blood pressure control of a patient with essential pressure hyper tension was conduct to the identification of differences of demographic characteristics, socioeconomic factors and living habits. This study was performed on 219 cases who were divided into two groups from Sept. 14 to Oct. 20, 1979. One is the group with complication in the departments of internal medicine and outpatient of 7 hospitals in Seoul. The other is the group without complication in the same places as above. The instrument applied to this study consists of 19 items amended through preliminary test after consideration of related literatural review and Nursing History made by Smith (1965). The materials were analyzed by computer program. The findings were as follows : 1 . The group with complication had more sleep disturbances than the group without complication 2 . The group with complication used more short term coping method on stress than the group without complication. 3 . The group with cnmplication had a tendency to more intake of salt, fat, alcohols and cigretts than the group without complition, but there were no significant differences between two groups. 4 . The group with complication were lower social class than the group without complication. 5 . The group with complication were more single( Death of spouse, Divorce, Separation) in marital status than the group without complication.