Cutter suction gas hydrate solid state fluidized mechanical mining is one of technical solutions proposed for seabed hydrate mining. Based on the discrete element method (DEM)

a quasi-3D numerical simulation model for single-tooth cutting hydrate is established to study the hydrate breaking process and the force of the cutter teeth in the cutting process. The results show that:1) Hydrate fracture still follows the failure mechanism of rock

pure hydrate is plastically destroyed

and marine hydrate deposition is brittle fracture; 2) the deeper of cutting thickness

the larger volume of the collapsed marine hydrate deposits; 3) when the cutting thickness is less than 8 mm

the cutting force increases linearly with the cutting thickness. The feasibility of study to crush hydrate by threedimensional discrete element method. The research results can provide basis for the design and mining parameters of the cutter suction mechanical mining and the cutter head.