Social capital in the community in Waplau village, Buru District grows and develops along with the achievement of fulfilling the necessities of life. Cooperation relationship in oil refining activities of eucalyptus leaves are awakened among land owners, tenants, rental workers and lids so that the social capital is established with participation, trust, cooperation and mutual relations and become a constantly preserved norm. This research is conducted based on the preference of the implementation of Eucalyptus oil refining process in Waplau village as an effort to benefit and fulfill household needs. The research location is focused in Waplau village with the consideration of the number of the more dominant eucalyptus oil workers compared to its municipal village in Buru Regency, research samples are landlords of eucalyptus trees, land tenants, rental laborers, and Dealer. Research using primary data obtained from observations and interviews directly with the informant. The method of data analysis used to follow the concept presented by Miles and Huberman and Spradley. The results showed that social capital became an indicator of the success of eucalyptus oil workers in achieving the objectives. Aspects of social capital has a strong relationship with the existence of landowners, tenants and rental workers, as well as working groups between children, leaf sequencer, cooks and laborers in completing oil refining tasks so that social capital Able to be an instrument for the productivity of eucalyptus oil in Waplau village.