Abstract：Dynamic compaction is an effective method in ground improvement. The application of this method is restricted
because of its noise，vibration and construction environment. The object（be foundation soil） by dynamic compaction is very
complex， so it is impossible for establishing an universal theory to suit for every kind of foundation soil. Attenuation
characteristics of vibration and the influence of trench in hydraulic filling are studied by field detection in dynamic engineering
of Caofeidian industrial park. The paper puts forward the experience formula of attenuation of acceleration and project plan of
trench. The conclusions have great significant for application of dynamic compaction construction in hydraulic filling.