The study on Gangi of public housing of Hokkaido and Aomori's prefectures has been conducted to find out relations between dwelling units and Gangi when it is planned as a common space. As a result, new arrangements are found to enhance relations between Gangi, dwelling units, and outdoor environments. The following three points are recommended by the auther. 1) Gangi should be arranged in south to get much heat. 2) Gangi has to be positioned beside the living room. 3) Gangi should connect inside and outside environments in order to work functionally as Engawa.