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Natural gas hydrates typically contain 85 wt.% water and 15 wt.% natural gas, and commonly belongs to cubic structure Ⅰ and Ⅱ. When referred to standard conditions, 1m3 solid hydrates contain up to 172Nm3 of methane gas, depending on the pressure and temperature of production. Such large volumes make natural gas hydrates can be used to store and transport natural gas. So, the tests were performed on the formation of natural gas hydrate is governed by the pressure, temperature, gas composition etc. The results show that the formation pressure of structure Ⅱ is lower about 65% and the solubility is higher about 3 times than that of structure Ⅰ.