Abstarct: cross-shore profiles of sandy beaches have an optimal role in analyzing and designing port areas, including commercial and fishing ones, because the cross-shore profiles will determine the sea's behavior in the coastal zone and will indicate the process of depth changes in this range. The active area usually extends from the coastline to the point offshore, where the movement of sediment from the effective wave is small. The equations that have been derived since the 1980s in determining important parameters related to the design of offshore structures such as docks, coastal walls and sea-bed pipes that cross the coastal area, as well as to create coastal boundaries and design coastal recovery projects have always had errors. This creates a higher design risk and as a result costs a lot. In this research, the cross-shore profiles of the southern shores of the Caspian Sea have been investigated according to data measured by the National Center for Caspian Sea Studies and Research And the type of cross-shore profiles and the number of its bar. In the following, according to the available data and regression analysis and the TLBO optimization algorithm, the equations of the geometric variables of the cross-shore profiles, which have the least error, are presented as equations conforming to the transverse Caspian profiles. baxsed on the results, the behavior of the coastal areas of the Caspian Sea is a stormy nature with a coastal erosion, which makes it possible to form multiple profiles (three bars) that are very high And geometric parameters of cross-shore profiles include the distance from the beginning of the first formation to the coastline and its depth, the distance of crest of highest bar to the coastline and its depth, the lasting distance of the last heath to the coastline and its depth, the tallest bar and volume The total bars formed using regression analysis and TLBO optimization algorithm with the lowest error values are obtained.