Aiming at the problem that the traditional sheet-pile structure presents excessive horizontal displacement in the application of large- scale wharf，especially for heavy load，soft soil foundation and deep water，we use the finite element software of PLAXIS 3D for simulation calculation，analyze the main factors causing the large horizontal displacement of the sheet-pile structure，formulate the effective countermeasures，and compare the horizontal displacement of the optimized scheme under the different water depth environments. The results show that the four specific measures of unloading measure on the structure，reasonable arrangement of mixing pile and jet-grouted pile，setting up good drainage channel，and reducing the mass of backfill material can effectively control the horizontal displacement，meet the limit value of British standard，and bring corresponding economic benefit at the same time.