Abstract: The Cap Model is suitable for the description of elastic-plastic behaviors of geo-materials.The conventional Cap Model was extended to describe multiple failure mechanisms of geo-materials with large porosity.It was then used to simulate the laboratory mechanical behaviors of sandstone with large porosity in oil storage areas.The laboratory results were in good agreement with the numerical simulations.The additional subsidence of sandstone with large porosity from oil exploitation by hydraulic injection is presented,the different influences of oil saturation and water saturation on sandstone stratum with large porosity are described,and the different failure mechanisms are also characterized.