Abstract: In order to effectively control rock stability of large section complex roof open-off cut, according to the characteristics of Bailong Mine 2-1101 large mining height fully mechanized mining face open-off cut, the supporting structure and the parameters are proposed, to verify the reasonableness of the support parameters, coal roadway stability analysis model was established, and stabilize state criterion of laneway's side is proposed. For roadway two-side instability state criterion as the strain of anchor bolt body should not exceed the its limit strain. A form of instability for the tunnel roof falling resistance F in shear plane is insufficient to overcome the decline of shear V, and occurs shear failure. Another form of compression damage occurred to the roof rock. According to mechanics calculation and analysis model based on open-off cut two-side and roof stability, the results show that the Bailong Mine large mining height open-off cut roof and the two-side are in a stable state.