【Objective】Based on the data of similar material proportions in large-scale model tests of highway tunnels, research on the preparation method of similar materials for large tunnel surrounding rock. Develop a liquid-solid coupling similar material composed of barite powder, quartz sand, white cement, iron powder, silicone oil, and water.【Method】Exploring the influence of different ratios on various physical properties and water rationality of materials through indoor experiments, and the specific ratio results of liquid-solid coupling similar materials were determined.【Result】The experimental results indicate that an increase in the content of white cement will significantly reduce the permeability coefficient of the material, while the binder will significantly affect the elastic modulus and compressive strength of the material, while the content of white cement remains un-changed. In addition, as the proportion of barite powder to white cement in the material gradually increases, the compressive strength of the test material will gradually increase. However, when the content of barite powder and white cement in the material reaches a certain level, the compressive strength of the material may slightly decrease. Increasing the ratio of barite powder to white cement within a certain range can improve the elastic modulus of the material. The shear strength is significantly affected by silicone oil.【Conclusion】Liquid solid coupling similar materials can simulate rock mass materials with different strengths and permeability, making them an ideal similar simulation material.