There are increasing needs for complex information services for user of cultural heritage institution recently. And the concept of "Larchiveum", merging of functions of libraries, archives and museums, is suggested in United States and researches associated with this concept are progressed on Korean information science. At present, however, the larchiveum has not been materialized, and hence researches focus on theoretical frameworks. Therefore, this study establishes plans for an analysis with planning of institutions that libraries, archives and museums are remodeled into larchiveum. Methodologically, the research processes of existing larchiveum spatial planning are specified. More realistic implementing measures for larchiveum spatial planning are suggested through utilization of related law & guidelines as analysis tools.