Abstract: This paper examines the 147 engineering geological drilling holes through the construction and collection, the Yoco port in the area were divided into 6 engineering layers and 16 sub-layers according to their types of formation, chronology, lithology and mechanics. The authors also made a comprehensive study on the spatial distribution of soil, engineering geology and geotechnical changes of the foundation soil(less than 50 deep),as w ell as the paleo-geog raphy of different areas of engineering geology. The study area was divided into the marine plain of engineering geological zone, delta plain engineering geological zone and beach reclamation engineering geological zones by comprehensive considering geomorphologic unit, genetic types, structural characteristics of soil and the presence of mainly environmental engineering geological problems. On the basis of engineering geological division, the development and utilization of underground space exploitation and utilization of geological conditions are valuated with the main force bearing layer and poor soil mass, which provides basic geological basis for the planning, construction and management of the port area.