Abstract: Different size of coal gas desorption attenuation coefficient and desorption intensity of the laboratory study, Discussion on the size of strength of desorption. Through nonlinear fitting on clastic coal core gas desorption laws in Jiedong mine, compared each desorption model of the loss to the loss of volume by calculation methods. Finally, compared the measurement error about use the measured desorption model of the gas content and the gas content measured by the indirect method, raised a suitable gas desorption model of clastic coal core in Jiedong mine.