Abstract：Water soluble gas is an important unconventional nature gas, it is only less than nature gas hydrate all over the world.The study of water soluble gas is significant to recuperate the energy short.In order to make certain nature gas content in groundwater and controlling factors, and discuss the geological condition of water soluble gas accumulation.Experiment and previous investigation on water soluble gas, and composition and classification of water soluble gases are described.The formation of water soluble gas is controlled by temperature, pressure, and groundwater mineralization.The distribution and accumulation of water soluble gas are mostly controlled by gas source, formation pressure, and trap.It is first suggestion that¹³CH₄preference soluble and postponement released than¹²CH₄in groundwater.

Keyword：Water soluble gas;Solubility;accumulation;Controlling factor;