Abstract: Based on the high requirements of technique and equipment, there is relatively few researches on the kinetics of gas hydrates. In this paper, we mainly study the effects of temperature pressure and pore radius of sediments on the formation kinetics of methane hydrate. It turns out that as the pore radius of sediments is 250~355 μm and pressure is 5 MPa, methane hydrate can be quickly synthesized at 1℃; as the pore radius of sediments is 180~250 μm and temperature is 2.5℃, methane hydrate can be quickly synthesized at 5 MPa. We also find out that as the pore radius is between 125 μm and 700 μm, it has little to do with the reaction.