By using the GDS dynamic triaxial tests on Zhoushan Daishan marine soil,a series of strain control dynamic triaxial tests have been performed.Change of hysteretic loops character of Zhoushan marine soil under different strain amplitude has been studied,a method of using hysteretic loops to construct the backbone curves is found.As well as doing fitting curves and analyzing according to experiment datum.The datum were simulated by three modules,such as Hard-Drnevich model,modified Hard-Drnevich model and Martin-Darvidenkov model.To get the backbone fitting curves,the accuracy of the numerical simulation and parameter sensitivity of different modules with varying confine pressures have been analyzed.Results show that Hard-Drnevich model cannot fitting well for it cannot reflect Zhoushan marine soils Strain softening.While modified Hard-Drnevich model and Martin-Darvidenkov model can fit datum well.In view of the parameter sensitivity and accuracy,modified Hard-Drnevich model is suggested to be used to simulate Zhoushan marine soils,parameters gained by this article has some significance for civil engineering.