Compaction of a loosely deposited sandy ground is one of the remedial measures against liquefaction. The compaction of the ground needs a reliable design in the degree of the compaction and the extent of the compacted area. In order to determine these items, the due consideration should be given to the following questions: (1) Is it possible for the compacted ground to gradually liquefy under the influence of the liquefaction at the adjacent uncompacted ground? (2) What will be the excess pore water pressure in the compacted ground due to the seepage flow from the liquefied ground? (3)What will be the stability of the compacted ground when it is influenced by the excess pore water pressure due to the seepage flow?
　These questions bring the authors to conduct shaking table tests of partly loose and partly dense saturated sands in a container of five meters in length, 1.5 meters in height and width. The results of the tests are analysed and the results of the analysis indicate several factors which should be considered for designing the compaction of the ground.