TheCandHisotopiccompositionsofthemethaneinmorethan160gassamplesfrom10basinsinChinaarepresentedinthispaper.Thenaturalgasesareclassifiedasfourtypes:biogenicgas,bio-thermocatalytictransitionalgas,gasassociatedwithcondensateoil,andcoal-typegas.Theisotopiccompositionsofthesegasescloselyrelatedtothedepositionalbasins,thetypesoforganicmatter,thestagesofthermalevolutionandthegeneticcharacteristicsofdifferentgasreservoirs.StudiesoftheCandHisotopiccompositionsofterrigenousnaturalgaseswillprovidevalua-bleinformationontheprospectinganddevelopmentofnaturalgasesofdifferentgenetictypes.