Abstract: The formation and accumulation of coalbed gas are closely related to the paleogeothermal field of the coal metamorphism.This paper simulates the paleogeothermal field of the coal metamorphism with vitrinite reflectance(R_o,max),using methode of inversion.It is revealed that the formation and accumulation of coalbed gas of the Late Paleozoic in China are closely.related to the movement of plates in China and its control function to regional geothermal field.