Chloride ions penetration is one of the major problems that affect the durability of reinforced concrete structures. To predict the chloride profile in concrete subjected to a saline environment, a coupled multiphase model of chloride ions penetration taking into account the effect of diffusion and convection is developed. Based on the proposed model, a numerical analysis of the effect of convection on chloride penetration in concrete is done. The results indicate that not only chloride diffusion but also convection flow of chloride ions has an important role in moving the chloride ions in concrete, which could provide a reference for the realistic assessment and design for durability of concrete structures.