Based on an excavated harbor basin engineering,we expound the design of combined steel sheet-pile structure with a load-relieving slab and its key technology.This structural type fully integrates the bending capacity of the front sheet pile wall,1 000 PHC piles and load-relieving slab to resist the horizontal and vertical loads in the form of rigid cap.The novel structure has been successfully used in excavated harbor basins and it provides technical reference for the design of similar projects.