Cajeput waste has the potential to source compost but has high C/N and essential oils so that decomposition naturally takes a long time. The objective of the study was to find an appropriate method in the decomposition of Cajeput waste through the addition of bioactivators. The bioactivators used are Aspergilus, Trichoderma, a combination of Aspergilus + Trichoderma and MA-11. Aspergillus and Trichoderma were obtained by isolation from Cajeput waste, while MA-11 was a bioactivator from outside the Cajeput waste. The study was conducted using a complete randomized design with five treatments and three replications. Observation parameters were C, N, C/N, P and K levels. The results showed that the addition of bioactivator can accelerate the process of decomposition of Cajeput waste. The decomposition of Cajeput waste with the addition of bioactivator takes 10 weeks, whereas without bioactivator takes more than 12 weeks. The best bioactivator is Trichoderma, capable of producing compost fertilizer with N content of 1.56 ± 0.10%, K of 1.02 ± 0.10% and C / N of 16.58 ± 2.37.