The purpose of this study was to determine the effect of addition synbiotic from inulin Gembili tuber extracts (EIUG) with Lactobacillus plantarum on the interior of egg quality of Pengging ducks. The material used were 100 female pengging ducks, 75 weeks old, with an average body weight of 1,467 ± 90.86 g. The design used was complete random design (CRD) with 4 treatments and 5 replications. The treatments were T0 = control feed, T1 = control feed + 1.0% synbiotic = 1.5 ml / 150 gram ration, T2 = control feed + 1.5 synbiotic % = 2.25 ml / 150 gram ration, T3 = control feed + synbiotic 2.0% = 3 ml / 150 gram ration. The parameters observed were egg yolk index, haugh unit, yolk color and yolk pH. The data were analyzed using analysis of variance with the F test. The results showed that the addition of synbiotics had no significant effect (P> 0.05) on interior egg quality, including egg yolk index, haugh unit, egg yolk color and egg white pH. The conclusion of this study was the use of synbiotics from inulin gembili tuber extract with Lactobaillus plantarum up to the level of 2% = 3 ml / 150 g ration was not effective, because the age of the Pengging duck was very old, so it was unable to increase egg yolk Indekx, Haugh Unit, egg yolk color, and white egg pH.