Abstract: Larvul ngabal effectiveness in the resolution of the conflict in Southeast Maluku covers all aspects of customary law that became the foundation of the Kei grounded in social life as well as the basis for decision making by both individuals and groups in determining policy. All policies and decisions based on customary law larvul ngabal embodied in the seven fundamental ground rules that classification into three categories (Nev-nev, Hanilit, and Huwear Balwarin), each of which were translated into seven chapters, which form the basis of relationships and social order in Kei Southeast Maluku. Therefore, believed to be the tool of civilization in Kei by these traditional institutions can solve all the problems of society. For the Kei, larvul ngabal also has the strength and recognition of the validity and relative nature never changes.