A port engineering involves land reclamation with backfill soil foundation,where soil layers are complex and uneven.In response to the complex and weak backfill foundation,in order to verify the reinforcement effect of dynamic compaction treatment and optimize the dynamic compaction construction parameters,we use a compaction energy of 2 500 kJ,and apply technical measures to reinforce the foundation,such as multi-zone test compaction,multiple point compaction,setting the maximum number of compaction blows,repeated compaction,and ensuring rolling.Then we analyze and evaluate the foundation before and after compaction by test method such as static load plate test.The dynamic compaction method can make the backfill soil foundation meet design requirements for reinforcement.