In foundation treatment, the dynamic compaction method is usually used for soil foundation reinforcement, its working principle is mainly to produce strong shock waves on the foundation for destroying soil internal natural structures so as to realize the soil consolidation, increase foundation bearing capacity, reduce its compressibility and improve performance of the foundation. Dynamic compaction method has such characteristics as broad scope of application, remarkable strengthening effect, effective and large reinforcement depth, easy operation, fewer materials and less cost. Taking an actual project for example, introduced is the engineering design and construction in foundation treatment by the dynamic compaction method, which will provide experience for future similar projects.