The multi-channel combined with low negative pressure dynamic compaction method was used to reinforce the ground in the Tongzhou Bay Science and Entrepreneurship Town in the coastal zone of Nantong. The change process and characteristics of ground water level, surface settlement, horizontal displacement of deep soil, pore water pressure, and vacuum degree were analyzed. The main physical properties, soil strength, and bearing capacity of the treated foundation were tested and evaluated. The results show that, the underground water level in the field can quickly drop to less than 3 m under the condition of continuous rainfall, a negative pressure condition was formed within a depth of 7 m using the vacuum method under the non-seal condition, and super static pore pressure caused by dynamic compaction can rapidly dissipate in 2 to 3 days. Influence of dynamic compaction was mainly based on settlement compression, the lateral displacement was small, and the physical and mechanical properties of soil were improved significantly, with the effective depth reaching 6. 5 m and the characteristic value of bearing capacity of foundation reaching 80 kPa. The new technology can enhance the ability of water drainage and the rapid dissipation of super static pore pressure. It is worth popularizing and applying in areas of abundant groundwater and rainfall.