To study the feasibility of impact compaction on the foundation and subgrade compaction in Yellow River flooded area and explore construction process and control parameters that could ensure good compaction results, experiment was conduct on impact compaction. By way of detecting the influence of impact compaction on settlement, moisture content and degree of compaction in different construction technology to analysis the feasibility of impact compaction on the foundation and subgrade compaction in Yellow River flooded area. By evaluating the effect of compaction of different construction techniques, appropriate construction technology and control parameters of impact compaction on foundation and subgrade in the Yellow River flooded area was summarized. Research results showed that impact compaction had a good compaction effect on foundation and subgrade in Yellow River flooded area. For foundation compaction, discontinuous impaction construction should be adopted and control parameters should use degree of compaction and settlement and the best impaction times should be 12 -14 times. For subgrade compaction, the thickness of the loose layer should be 80cm and the best impaction times should be 25-30 times.