Taking six typical epikarst systems in China as examples, the authors summarize their features of geochemical variations, and analyze their environmental significance.

It has been found that epi-karst dynamic system is related closely with CO2 content in soil and that temperature and rainfall dominate the seasonal change of CO2 content in soil.

Karst ecosystem is a ecosystem controlled by karst environment, and epikarst ecosystem is the most active part of material exchange and energy flow in karst ecosystem, it is sensitive to the global carbon cycle in Quaternary, especially in late Holocene.

Carbonate rocks are widespread along the south Tianshan, where the function of karst system depends on the texture of karst medium.