In order to further enhance the engineering quality of deep soft rock fill after dynamic compaction treatment, four kinds of energy level dynamic compaction tests were carried out, including low, medium, high and super high. By systematically monitoring the settlement per blow and ground heave deformation, the relationship between settlement per blow and the number of compaction blows was analyzed, along with the deformation patterns of ground heave around the compaction pit. Through dynamic penetration tests, curves illustrating the variation of dynamic penetration resistance with depth before and after dynamic compaction were plotted. Based on these results, the first reinforcement depth and the second reinforcement depth were determined. The results show that the settlement of dynamic compaction shows significant nonlinear characteristics as the number of hammer blows increases, which can be divided into three stages : rapid development stage, stable development stage and stable stage. The soil near the rammer has significant settlement under the action of huge impact pressure. The settlement amount decreases as the distance from the center of the compacted pit increases. The soil on both sides of the rammer is squeezed by the lower part, and there is a little uplift. The influence range of ground deformation around the ramming pit is mainly concentrated in 3-12 m. The dynamic compaction reinforcement depth is divided into the first reinforcement depth and the second reinforcement depth by using the growth rate of the number of dynamic probes before and after dynamic compaction. It is found that the first reinforcement depth, the second reinforcement depth and the tamping energy are basically polynomial related. The research results can not only provide reference for the design and construction of dynamic compaction method, but also help to effectively control the construction of dynamic compaction in many aspects such as construction period, cost and quality, and further promote the application of dynamic compaction technology in engineering practice.