Abstract: Several kinds of sea wall structures are introduced. The equivalent pile top load of each pile of double-row-pile sea wall is obtained by means of the method of structure displacement. The loads acting on the tip of the sea wall are equivalent to those at each pile top. Bending force and transverse distortion along pile are calculated under three kinds of working conditions, which are single pile under load during construction period, fugacious load domino effect combination during sea wall construction period and permanent load domino effect combination during common operation period. Influences of changes of pile spacing between and row spacing on load transfer characteristics of sea wall are analyzed.