If sago pulp waste is not managed properly, it will cause pollution due to the rotting process, which can cause an unpleasant odor. Therefore, the use of waste or by-product sago pulp as a feed ingredient is one solution in reducing environmental pollution and its impact on the growth and production of duck carcass. This study1was aimed to be determined the effect of administering fermented sago pulp waste at different ration levels on the Peking duck's production and carcass percentage. The sample was 96 Peking day old duck (DOD) of different sexes (unsexed), reared for approximately 8 weeks. Furthermore, they were1placed in 4 treatments1and 4 replications (6 ducks/replication). The method used was a completely randomized design (CRD). It consists of 4 treatment rations, including P0 (feed control/no fermented sago pulp); P1 (feed containing 10% fermented sago pulp); P2 (feed containing 20% fermented sago pulp); P3 (feed containing 30% fermented sago pulp). Variables observed were the final1body weight, carcass1weight, carcass1percentage, and weight and percentage of the parts (chest, wings, thighs, back). Data were analyzed using Analysis of Variance (ANOVA) and continued with Duncan's Multiple Test. The results showed that using fermented sago pulp in the ration of aapproximately 10% had a significant effect (p<0.05) on carcass weight, carcass percentage, weight and percentage of carcass pieces. Therefore, it is appropriate to use approximately 10% of fermented sago pulp in the ration to obtain the best results on the production and carcass percentage of 8 weeks Peking ducks.