Equilibrium hydrate formation conditions for methane with methylcyclohexane (MCH), and a ternary gas mixture of methane, ethane, propane with methylcyclohexane are obtained by employing the isothermal pressure search method. Methylcyclohexane is reported to form structure H gas hydrates with a help gas. The equilibrium pressures of the ternary gas mixture-methycyclohexane system are higher than those of the ternary gas mixture without methylcyclohexane system at the experimental temperature range. The experiments are carried out in the pressure range of 0.935-11.933 MPa and the temperature range of 273.59-290.62 K.