Abstract: Considering the genetic mechanisms of abnormal pressure of coal reservoir in process of geologic uplifting,through quantitative simulation analysis on geologic uplifting process in Qinshui basin and Tabamiao district,the variety of fluid physical volume of coal reservoir causing pressure variety of coalbed gas is analyzed,which reflects the dynamic evolvement process of whole reservoir pressure in the process of geologic uplifting,resulting in conclusion that means the geologic uplifting process is an important mechanism of abnormal low pressure.