This paper presents a precious field practice of the soil improvement on the reclaimed land located at the western coast of middle Taiwan. Two kinds of techniques, Stone columns(SC) and Dynamic compaction(DC), were used to reduce the liquefaction potential of soils. During the progress production, three main concerns were found that influenced the performance. It includes (1) Maintenance of rigs, (2) Existence of clayey soils in the reclaimed layer and (3) High groundwater table, which were highlighted and addressed in the paper for reference. The authors also propose a new concept, named Isolation and Pre-dewatering, to increase performance of DC method.