In order to verify the feasibility of FEM software ABAQUS’s application to the chloride diffusion in concrete，we carry out an analysis of the previous test by ABAQUS，and develop a subroutine based on USDFLD in ABAQUS to take the time-dependent coefficients，i.e.the diffusion coefficient and the surface chloride concentration into account.We also discuss the influence of the element size and the FEM model dimension on the results.The results indicate that the ABAQUS analysis has a good agreement with tests results，proving that the mass diffusion (MD) module in ABAQUS is able to simulate the chloride diffusion without concerning time-dependent coefficients；while with the developed USDFLD subroutine，the time-dependent chloride diffusion problem can also be solved.For the FEM model，good precision can be obtained when the element size is smaller than 5% of the dimension in the diffusion direction.The models with different thicknesses have distinctions about the chloride diffusion.