Methane hydrate is formed by physical binding between water molecules and methane gas, which is captured in the cavities of water molecules under the specific temperature and pressure. When methane hydrate is artificially formed, there is no repeatability at the repetition experiments of the same conditions. Therefore, for the practical purpose in the application, the present investigation focuses on the repeatability through the experiments on methane hydrate formation time and gas consumption. The results showed that the hydrate formation was a stochastic phenomenon. However, if the water was agitated by magnetic stirrer or the subcooling temperature was increased, the stochastic phenomenon was depressed.