We　present　a　hypoplastic　model　to　capture　the　mechanical　responses　of　hydrate-bearing　sands　by　incorporating　hydrate　saturation　and　grain　breakage.　In　our　model,　a　new　degradation　scalar　is　introduced　to　account　for　the　effects　of　hydrate　bonding　evolution　on　strength.　We　also　adopt　the　variable　critical　state　line　to　assess　the　effects　of　hydrate　saturation　and　relative　breakage　ratio　at　high　confining　pressure.　This　model　is　validated　by　modeling　a　series　of　laboratory　tests.