Abstract:Combined with the construction experience of a port and road project in the south coastal area, this paper sums up and analyzes the methods of the Project Foundation Treatment on the soft soil of the littoral-sea-land sedimentary deep and thick layer. It is hoped that through the summary to deepen the understanding of the designer to the characteristics of the deep soft soil in the southern coastal area and the method of its foundation treatment, and hope it will be of reference value to someone else.