Abstract: In response to the characteristics of deep buried steeply dipping working face roadway such as large deformation and difficult to support, taken Chen Manzhuang coal mine panel 3402 as background, theoretical analysis, Udec2D software and fiber borehole observation were used to analysis factors that influence the roadway deformation. Meanwhile, based on the roof cracks developing, reason that caused frequently roof-fall accidents in upper-end of working face has been studied. The results indicated that high ground stress, well-developed parallel plane fracture in roof, well-developed vertical fracture in coalsides and surrounding mining are main reasons that cause the large deformation of roadway. The optimal section form of roadway is semicircle arch, echelon cross section is better compared with rectangle cross section. Affected by the large deformation of roadway, roof in the upper-end of working face was fractured before the excavation, which is the main reason roof-fall accidents happen frequently during the advancing of working face.