As a kind of self-supporting supporting structure, lattice diaphragm wall is used in soft soil areas such as ports, wharfs and shipyards in the past, but it is rarely used in complex hard rock strata. Taking Laiwushan slope support project in Longhua District of Shenzhen as an example, the construction site preparation, solitary stone treatment, rock entry process, steel cage hoisting, cross steel plate joint treatment and other key processes were discussed, which provide a reference for the construction of similar projects.