Abstarct: In this project, a binary composite containing MIL-100(Fe) due to its high surface area and low band gap, and ZnBi2O6 synthesized via the hydrothermal method. Then, a ternary composite MIL-100(Fe)/ZnBi2O6/AgBr with visible light activation capability was synthesized using the direct precipitation method. The prepared composite was characterized using analytical techniques such as Fourier-transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD). The efficiency of the prepared composite for simultaneous degradation of Methylene Blue and Methyl Orange under xenon lamp irradiation was investigated. The effects of experimental parameters such as initial pH, composite dosage, and initial concentrations of dyes in a single-component system were studied. The simultaneous degradation optimization of both dyes (Methylene Blue and Methyl Orange) was performed using the central composite design face-centered (FCCCD) method with response surface technique. The optimum levels of effective parameters were found to be composite dosage of 39/39 mg, initial concentration of Methylene Blue of 0/4 mg/L, initial concentration of Methyl Orange of 6/6 mg/L, and a reaction time of 71 minutes with a desirability plot. Under optimal conditions, the highest degradation efficiency for Methylene Blue and Methyl Orange dyes reached 97/11% and 98/73% respectively. Furthermore, kinetic studies indicated that the degradation process follows a pseudo-first-order model.