Private forest of Aritonang village is on customary land which is the inheritance of the ancestors in the form of gift/wages by Raja Aritonang to Ompu Guru Sukkunon (a descendant of the Ompusunggu clan) and Ompu Guru Solupa (a descendant of the Rajagukguk clan) are managed based on customary rules. The purpose of this research was to identify the customary rules that apply and to find out …