Aiming at the complex conditions of the connection embankment between blasting compaction and plastic drainage plate，we study the site selection and treatment method of the connection position. Based on the analysis of the geological conditions within the scope of the embankment foundation，we combine with the factors such as the construction sequence，overall stability，differential settlement，and project investment of the sea embankment，select the embankment section with thin soft soil layer，thick sand layer and axis corner as the connecting position. Based on the influence of blasting vibration，we reduce the blasting compaction advance progress in connection position，reserve the safety distance of drainage plate，implement the blasting compaction first，then implement the drainage plate，use the simplified Bishop method to check the stability of the embankment in the connecting section，add counter pressure platform to make a smooth transition with the adjacent embankment，and verify the effect on the site. The results show that selecting the reasonable connection position can effectively reduce the project investment，and ensure the safety and reliability of the sea embankment as well as the smooth connection of the plane.