This study aims to determine the effect of adding tofu dreg and chicken bone flour to the content of nutrients and compost quality of leaf midribs salak and to obtain a comparison between tofu dregs and chicken bone flour that can increase the nutrient content and quality of the compost of leaf midribs salak. The research was conducted at Green House Faculty of Agriculture University of Muhammadiyah Yogyakarta. The experiment was designed with complete randomized design (RAL) with single factor treatment design that is the balance of tofu dreg and chicken bone flour consisting of four treatments, that is comparison 4:0:20, comparison 3:1:20, 2:2:20 and comparison 0:0:20 (control). The results showed that the addition of additive of tofu dreg and chicken bone flour with a comparision 3:1:20 produced compost was in accordance with standards of SNI that is C/N 17,31, N 1,13%, P 3,15%, K 2,97%, organic matter 32,87 dan C organic 19,06%.