Based on measured data of 103 CBM wells in Changzhi and Anze Block in Southern Qinshui Basin，the adsorption time of coals with different degrees of deformation and its influencing factors were discussed，which can provide guidance for production prediction of coalbed methane well. The pore structures of coals with different degrees of deformation result in great difference in their desorption characteristics. As the degree of coal deformation increases，the adsorption time decreases quickly. In contrast to undeformed coal and weakly deformed coal，the desorption rate of strongly deformed coal is higher，and its amount of desorption increases sharply and the adsorption time become shorter because of well-developed fractures，macropores and mesopores which provide better connectivity and shorter migration path. In the late of de? sorption，the well-developed small pores and micropores of strongly deformed coal have strong adsorption ability and poorer connectivity，which increases difficulty in methane desorption and migration and therefore the desorption rate reduces markedly. However，the desorption rate of undeformed coal and weakly deformed coal changes slightly and their adsorption time is very long，which is the integrated result influenced by pore and fracture characteristics and geometry shape of coal core. Based on the drainage date of coalbed methane well，it can be drawn that the difference of coal deformation is the major reason for the production change of coalbed methane well. The adsorption time of coal can provide guidance for production prediction of coalbed methane well.