||One of the azo compounds, methyl orange(MO) is widely used in the industrial field and cause serious environmental pollution. Efforts to degrade MO have been carried out during past decades. Photocatalytic technique is considered to be the most promising wastewater treatment. Of the various photocatalytic materials, Au nanoparticles(NPs) have excellent catalytic efficiency. However, due to their high surface area, they form easily clusters, which leads to a reduction in catalyst efficiency. Therefore, supporting material is required to prevent AuNPs from forming clusters. Fe3O4NPs have magnetic properties and can easily be separated from water, so it can be used as a catalyst again. By applying this, it is expected the photocatalytic effect in the visible light region by adsorbing AuNPs on Fe3O4@TiO2NPs. In this study, physical properties of Fe3O4@TiO2-AuNPs were identified through TEM, XRD and XPS analysis and photocatalytic ability was confirmed by using UV and Raman spectroscopy.