According to reports of damaged port and harbor structures by earthquakes, deflection of vertical anchor piles of sheet pile wall is considered to be much larger than that calculated by the present design method. Therefore, after investigation of the experimental study by Kubo et al. and its application to design method, 19 series of model experiments were performed which were closer to actual sturctures than that by Kubo et al., i.e., with embedded anchor piles and tie rods and with varied conditions of embedded depth and distance between piles and walls. As consequences of analysing the results by the PHRI theory for lateral resistance of a pile, the following were made clear: the PHRI theory is also valid for the embedded anchor piles, assumption of S-type subsoil is not good to estimate the pile behavior, so that the present design method involves problems for some case, assumption of C-type subsoil is useful, the best estimation is made by assumption of trapezoidal distribution of horizontal subgrade reaction constant, and so on.