Abstract: In order to study the effect of weak interlayer horizon on roadway surrounding rock stability, the change laws of surrounding rock stress and displacement are analyzed at different horizons of the weak interlayer by using FLAC^3D software. The results show that deformation and stress concentration of roadway is smaller and the influence of weak interlayer is weaker, which is arranged at the horizons of model 1 and model 5, moreover, roadway arranged in model 5 is more stable and the influence of weak interlayer is weakest in six combination models of different weak interlayer horizons.