The shoreline utilization intensity,the index which can be used to evaluate the shoreline utilization efficiency of excavated-in layout and alongshore layout，is introduced to evaluate and compare the existing excavated-in layout and the alongshore layout.Introducing the restricting factors of the index,i.e.land width and land supporting area to realize the quantitative analysis of the shoreline utilization efficiency of the excavated-in layout.Then the evaluation index is applied to the engineering project,through which,the reasonable numerical scope of shoreline utilization intensity is obtained.