Abstract: Combined the engineering conditions of haulage roadway of 1528working surface in GeQuan Coal Mine, based on the research results of key stratum theory, the paper established a mechanical model which could reflect the basic features of rock stratum by ways of numerical simulation, the paper has studied the stress, deformation, and damage characters of fractures for gob-side entry retaining roof. Orthogonal test was adopted in this research to simulate influencing factors in roof fractures, and the paper made effect analysis and order, which determined the effect order finally.