Abstract: For 1402E haulage roadway, we research the instability mechanism and supporting technology of deep high stress semi-coal rock roadway by the methods of field research, numerical simulation and engineering practice. The results show that the main reasons of instability of deep high stress semi-coal rock roadway are buried depth of high geo-stress and large deformation owing to the anisotropic lithology of surrounding rock of roadway. Supporting effect is the best in 1402E haulage roadway when the anchor belt net cable support is used, and anchor length is 2 200 mm, diameter is 22 mm, and anchorage length is 1 000 mm, the pre-tightening force is 130 kN. Within engineering practice, the mean convergence amount of roadway roof and floor is 661.5 mm, and the average convergence of two walls is 553.5 mm.