Abstract: For lack of detection and analysis of effect of strengthening the sandy soil foundation by dynamic compaction method in situation, with the actual example in the project in this paper, using a variety of methods for detection and contrastive analysis of strengthening the sandy soil foundation between some dynamic compaction method and natural sand, evaluate objectively the effect of strengthening the sandy soil foundation by dynamic compaction method and discuss the factors influencing reinforcement effect. This research has accumulated experience for detection of reinforcement sand soil foundation by dynamic compaction method, and has important value and significance for improving application in the design, construction of dynamic compaction method.