In this work, the phase equilibrium conditions of gas hydrate formed using the gas mixture of mole fractions 0.3 CH4 + 0.6 N-2 + 0.1 O-2 in the presence of cyclopentane or cyclohexane were measured and reported in the temperature range of (277.4 to 293.1) K and in the pressure range of (0.89 to 4.87) MPa. The mass fraction of cyclopentane or 2 2 cyclohexane added into the aqueous solution was w = 0.07. It is found that the equilibrium conditions of gas hydrate formed at the 0.07 mass fraction of cyclopentane or cyclohexane are shifted to high temperatures and low pressures as compared to those obtained using the same gas mixture in pure water. Moreover, the mole fraction of CH4 incorporated into the hydrate phase is increased to approximately 0.5, which is higher than that in the original gas mixture.