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A combined method involving the use of deep mixed(DM)columns and prefabricated vertical drains(PVDs)was proposed to reinforce the soft soils.To obtain analytical solution of the composite foundation with DM columns and PVDs,the drainage system was converted into a cylindrical drain wall with the equivalent properties,and only the radial drainage was considered.An axi-symmetric unit cell was established and the solution of average degree of consolidation was derived.Based on the proposed solution a design chart was developed and was applied to a case history of an embankment on soft soil with short DM columns and long PVDs.A good agreement was found between the predicted average degree of consolidation and the field data.