Abstract: In order to study fissure distribution characteristics of large section coal roadway crossing broken belt and its influence on extraction roadway, we take the roof fracture zone in Dongpo Coal Mine 431 material roadway in the process of excavating as engineering background, we simulate roof fissure distribution of the 431 material roadway by the discrete element numerical analysis method, and reveal the roof fissure distribution characteristics, anchor cable reinforcement is presented in crushed surrounding rock of shallow formation of the anchorage structure of surrounding rock of constraint function, which realizes the effective control of roof caving. Engineering practice shows that the support with scientific guiding ideology and scientificity can apply in Dongpo mining working face in roadway.