Non-hydrocarbon constituents of natural gas are the resoures extracted non-hydrocarbon gases, as well as the important indexes as being prospected for hydrocarbon and researched in nature. This paper makes a systematic study on developments in Geochemistry (Occurrence, distribution, origin, isotopic geochemistry, etc.) of non-hydrocarbon constixuents (CO₂,H₂S,N₂,He,Ar,H₂,H₂O and Hg) of natural gas. Finally, the author charts the fields needed strengthen study in China.
    (1)Thermal dynamics of the non-hydrocarbon constituents in the Earth fluid system;
    (2)Contribution from the gas to the metal deposits;
    (3)Relation between non-hydrocarbon gases and petroleum;
    (4)Geological geochemistry of non-hydrocarbon constituents;
    (5)Global climate change and outgassing of solid Earth;
    (6)Relationship between methane hydrate in shallow crust and non-hydrocarbon gases contents in the atmosphere.