Abstract: In order to solve the problem of surrounding rock instability under the condition of high horizontal tectonic stress，the characteristics of roadway surrounding rock is analyzed in two supporting situation by the method of numerical simulation，and the treatment scheme that roadway floor uses the anchor beam of grouting reinforcement is proposed，at the same time the industrial test is carried on with numerical simulation.The results show that the original support way plays a good supporting effect for roof and two sides of the roadway，but the amount of floor heave of roadway is bigger；after the anchor beam of grouting reinforcement has been used in roadway floor，the cumulative displacement of roof to floor is 142mm，and two sides roadway’s cumulative displacement is 123mm，which decreases about 48% compared with the original supporting section，the effect of integral reinforcing action in floor anchor beam is obvious.The increase of floor heave of roadway can be controlled effectively，and the integrity and stability of the surrounding rock of roadway is ensured.