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methane and nitrogen form structure I and II hydrate, respectively, and therefore the structure typeence of size and shape, each hydrate structure shows diferent capacity to store the guest molecules. In this study, weinvestigated phase and structural behaviors according to the composition of methane+nitrogen gas mixture. Three-phase (H-Lw-V) equilibria of solid hydrate, water-rich liquid and vapor phase containing 25.24 mol% , 28.51 mol% ,31.23 mol% and 40.39 mol% of methane were determined at various temperatures (in the range from 273.30 K to285.05 K) and pressures (from 8.325 MPa to 20.700 MPa). 13C solid-state NMR spectroscopy and powder XRD methodof the methane+nitrogen mixture changes its structure from sI to sI between 25.24 mol% and 28.51 mol% of methaneconcentration. These results of phase behavior and structure identification for the mixed gas hydrates are expected tobe very helpful in evaluating the feasibility of exploitation of methane gas from natural gas hydrate and the separationprocess using gas hydrate as a storage-media