Based on the construction project of Hadarom port at Ashdod,Israel,aiming at the issue that according to the post-CPT test,some of the vibro-compaction points of foundation are not completely compacted without material filled.We comprehensively analyze the main reason of this issue based on the sampling of particle-size distribution test.Therefore,learning from the past vibro-compaction project experience of silty fine sand foundation without additional material filled,we carry out the optimization of construction equipment and method on site to guarentee construction quality that the foundation is completely compacted.In addition,it is suggested to use the laser particle-size analyzer to substitute sieve as a more reliable test method,as a reference for vibro-compaction construction in similar conditions.