Abstract: The paper proposes a new method of reinforcing deep and thick silt.The method uses the short-range and over-loading vacuum preloading dynamic drainage consolidation approach.It is based on the conclusion of soft soil drainage consolidation of S-T roundabout regularities.It is developed according to the characteristics of deep and thick silt soft soil in coastal areas and the requirements of engineering constructions substantial results.The approach also demonstrates that the primary consolidation settlement of deep and thick silt soft soil can be accomplished in a short time,under the optional regrouping of vacuum negative pressure and over-loading positive pressure as well as dynamic impact.The silt soft soil consolidation and settlement are capable of improving the intensity of the solid body while the ground surface dredged fill can become over-consolidating hard shell course under the dynamic impact.The consolidation of deep and thick silt soft soil can meet the requirements of ground bearing capacity and effectively control past-construction settlement and uneven settlement.The case study and the analysis as well as the assessment of the effect of groundwork dealings show the feasibility and validity of this new method.It provides a new way of reinforcing deep and thick silt soft soil groundwork widely spread in coastal areas.