Abstract: For the subject on drainage consolidation method of combining static and dynamic loading, the reconsolidation characteristics of saturated soft clay under impact loading are studied by laboratory tests , and particularly, the influence of drainage condition on consolidation and reconsolidation of soft clay are analysed. Based on test results, the uniqueness of the relationship between pore pressure and reconsolidation volumetric strain is pointed out . The methods for determining coefficient of reconsolidation volume compressibility and reconsolidation index are given. Finally, a model for predicting the settlement of soft clay foundation after impact loading is suggested, which fits well with test results.