Abstract: For the problem that the traditional combined support at -900 m level large section and soft rock roadway in Dianping Mine is failure, we analyze the failure mechanism and optimize supporting measure of roadway. Numerical simulation and field test shows that "bolting, anchor cable, metal net, guniting, grouting" combined support can better control the deformation and collapse of roadway. After 180 days, the max relative convergence from roof to floor is 193 mm; the max relative convergence of two sides is 118 mm; the amount of deformation is stable.