<p>In the physical model test of landslides, the selection of analogous materials is the key, and it is difficult to consider the similarity of mechanical properties and seepage performance at the same time. To develop a model material suitable for analysing the deformation and failure of reservoir landslides, based on the existing research foundation of analogous materials, 5 materials and 5 physical-mechanical parameters were selected to design an orthogonal test. The factor sensitivity of each component ratio and its influence on the physical-mechanical indices were studied by range analysis and stepwise regression analysis, and the proportioning method was determined. Finally, the model material was developed, and a model test was carried out considering Huangtupo as the prototype application. The results showed that (1) the model material composed of sand, barite powder, glass beads, clay, and bentonite had a wide distribution of physical-mechanical parameters, which could be applied to model tests under different conditions; (2) the physical-mechanical parameters of analogous materials matched the application prototype; and (3) the mechanical properties and seepage performance of the model material sample met the requirements of reservoir landslide model tests, which could be used to simulate landslide evolution and analyse the deformation process.</p>