In the karst process,the dissolution of the carbonate minerals,such as CaCO_3 and CaMg(CO_3)_2, is essential in the presence of water and under a normal atmospheric temperature/pressure environment,involving the consumption of atmospheric CO_2into Ca~(2+)/Mg~(2+)and the anion bicarbonate.Usually,the hydration of CO_2to HCO_3~- is relatively slow,especially in the forward direction,of which the CO_2are originated from different sources resulting from a complex interaction between geology,climate and hydrology,and also biological components.In this paper,previous researches in the fields of karst,geochemistry and biology were overviewed.The main points of this paper are to address the issues on karst biogeochemistry process, the biological action involving chemical weathering of carbonate rocks and element cycle,the gas circulation in the interface between soil and atmosphere,organic pollutants in the karst environment,as well as the function of microorganism relating to karst carbon cycle,with a major focus on water-soil erosion and rocky desertification.To understand the above problems,the function of earth creatures in the karst environment must be valued.