Abstract: Describing the stress-strain relationship of hydrate-bearing sediments, establishing a mechanical model of hydrate-bearing sediments and predicting the deformation of hydrate reservoirs are the basic prerequisites for the effective development of hydrate resources. In this study, the triaxial compressive properties of fine sandy hydrate-bearing sediments are analyzed to examine the applicability of a nonlinear elastic constitutive model based on the Duncan-Chang model. It is shown that the proposed model can describe the stress-strain behavior of fine sandy hydrate-bearing sediments, which demonstrates the validity and reasonability of this model.