The aim of this paper is to research the features in form and function of "Gangi" which is built in the public apartment houses in Hokkaido and Aomori. Accordingly I will study it's improvement planning and new planning system of common space of public apartment housing in snowy region. 1)We have many types of "Gangi" arranged to apartment houses in snowy areas. But all of those houses are not chained to each other with them. 2)The present "Gangi" has many problems on snow removing, icy floor, and so on. 3) It is necessary to improve it and prepare the new planning system of "Gangi" and common space.
