Abstract: Soil carbon pool as the biggest carbon pools in the terrestrial ecosystem has played an important role in the carbon dynamic.Compared with many researches on the soil organic carbon,the research about the soil inorganic carbon are limited.The properties,changes and significance on global climate problem of soil inorganic carbon were discussed in the article to give a reference for the research about soil and climate in the future and stabilize the important role of soil inorganic carbon in the global carbon cycle.