In view of the safety and stability problems caused by the foundation trench excavation of gravity wharves to the adjacent engineering facilities，this paper takes a wharf project in western Guangdong as an example and selects the grouting micro-steel-pipe pile as the supporting structure through comparison and analysis of various supporting schemes. The results of theoretical calculation and field practice indicate that it is feasible to adopt multi-row grouting micro-steel-pipe piles as the supporting structure. The whole structure is formed through the “coupling effect” of pressure grouting，and the strength of implanted steel pipes is used to provide resistance，which can satisfactorily eliminate the influence of foundation trench excavation on the adjacent built revetment.