Abstract: In order to solve the problems of large convergence of two sides、serious floor heave and rid spalling in the conveyor gateway in the first working face of a coal mine,set up loose circle monitoring section,analysed the evolution law of loose circle and instability mechanism of surrounding rock.They shows that the gateway surrounding rock is strong roof-weak sides-weak floor.Put forward new supporting scheme for strengthening sides and foot of full anchor cable.A field industrial is carried out,the results of field monitoring shows that convergence of two sides and floor heave are within a reasonable range,rid spalling is eliminated,indicates that the new supporting scheme is reasonable and feasible.