Compressionsettlementcalculationofhighliquidlimitsoilhasbeenwidelycon-cerned.In order to study the influence of bound water on compression characteristics of high liquid limits oil and improve the accuracy of consolidation compression calculation， the high liquid limits oil of Hainan Wan yang Expressway is selected to study， and the bound water content is tested by volumetric flask method， and the micro-test of SEM and XRD a-nalysis is carried out to study the soil composition.The influence of composition on the ad-sorp tive properties of bound water is discussed.A modified soil void ratio calculation meth-od considering bound water content is proposed， and one-dimensional consolidation tests of saturated soil under the same conventional void ratio and modified void ratio considering bound water content under different bound water densities are carried out respectively.Atthe sametime， Changsha sandy soil is selected as the comparative study.The results show that the bound water content of Hainan high liquid limits oil is much higher than that of Changsha sandy soil； the clay content， hydrophilic clay mineral content and kaolinite super-position structure in the soil affect the adsorption performance of bound water； the density of bound water is about 1.3g/cm， the consolidation compression of the two soil samples changes with time are consistent after considering the bound water content， and the water content after the end of the test is higher than the bound water content of the sample， which is difficult to remove in engineering practice， and the bound water can be classified as apart of solid phase.It is suggested that the method of calculating the void ratio of high liquid limits oil should be revised in consideration of the water content， which has practical signifi-cance for the compression characteristics of high liquid limits oil subgrade and engineering application.