The anchor holding capacity factor, Nc, for the plate anchor in cohesive soil depends on various parameters, such as the anchor embedment ratio, soil overburden pressure, soil non-homogeneity, the roughness and thickness of the anchor fluke, geometry of the anchor shank and suction force beneath the anchor fluke. The capacity factor for plate anchor in cohesive soil suggested in this chapter provides a conservative solution based on a smooth fluke with a thickness ratio B/t = 20, without considering the possible resistance which may be taken by the anchor shank and the suction force.