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The main problems in Integrated Solid Waste Treatment Facility (ISWTF) Diponegoro University is the large amount of waste disposal that must be managed every day, that is 11,82 m3/day. ISWTF Diponegoro University has made effort to reduce the waste disposal, one of them by producing compost from dry leaves waste with adding EM4 activator. Therefore, in this study will be made a organic waste composting of dry leaves waste in ISWTF Diponegoro University by performing the addition of leaves as an bio-activator. The goals of this research is to know the influence of the usage of bio-activator against the content of C-Organic and N-Total from the product of solid compost. Variations made on the study i.e. compost without addition of bio-activator, compost with addition of bio-activator 1 (Terminalia catappa – Switenia mahagoni), bio-activator 2 (Terminalia catappa – Pterocarpus indicus), and bio-activator 3 (Terminalia catappa–Switenia mahagoni–Pterocarpus indicus). The optimum variation for solid compost is variation with bio-activator 2 (Terminalia catappa- Pterocarpus indicus) with the value of C – Organik 24,353% and N – Total 1,227%.