Abstract: Aiming at the problem of strong strata behaviors of Bayangaole Coal Mine roadway in Inner Mongolia,based on the field observation and theoretical analysis,we studied the mechanism of the strong strata behaviors of roadway and its prevention measures through analyzing the fracture characteristics of upper key strata and surrounding rock stress of roadway.The results show that,after the mining of the adjacent face,the mining working face will make the upper key strata broken.If the hanging arch length of upper key strata is too large,much energy will release when this strata breaks,then the stress loaded to the lower key strata will increase,which increases the pressure loaded to the surrounding rock of the roadway.Because the relative positions between the different roadways and the broken rock blocks of upper key strata are different,the stress of these roadways is different. As a result,the strong strata behaviors will occur only in the return air roadway. Hereby,the prevention measure is proposed, and the effect is remarkable in the field application.