Based on the South China Sea emergency salvage and support base project,we optimize the crest elevation of the sloping breakwater allowing wave overtopping to minimize investment while upholding the stability of harbor mooring conditions,wharf structure,and structural safety of breakwater.By conducting wave section physical model tests,we simulate secondary waves behind the breakwater and overlaid with diffracted waves calculated by mathematical models.Then we calculate wave forces on wharf structure for varying crest elevations,carry out the structural safety analysis of wharf by finite element software,and verify the stability of the breakwater structur by wave section physical model tests.The results indicate that for projects with separate dock and breakwater layouts,breakwater protection requirements can be suitably reduced.Ensuring the crest elevation does not exceed the design high water level + H13% of once every two years effectively maintains the safety and reliability of breakwater and wharf structures.