Abstract: Aiming at the conditions of geological and production of the 4101 false slope mechanized mining face with large cutting and angle which is affected by the small fault structure, this paper analyses the influencing factors on stability of the "bracket-surrounding rock" system, and studies the initial pressure law on main roof of the 4101working face by the methods of UDEC numerical simulation, and theoretical calculation and field measurement of mine pressure behaviour. The results showed that: the initial pressure on main roof of 4101 false slope mechanized face with large cutting and angle present the features of segmented weighting, which avoids the large-scale effects on the working face by the breaking and weighting of whole main roof at the same time. However, it appears stress concentration on the roof of the lower end head and small faults area of the working face, and mine pressure behaviour is relatively strong, which should be focused on strengthening management and control.