Abstract: Multiple faults occur in the WII02040501 working face of Tunbao Coal Mine and run through the whole working face,and one side is mined out. In view of the abnormal microseismic and mine pressure behavior in the triangular coal pillar area during the mining period of the working face,the mechanism of stress anomaly in the triangular coal pillar area under the mining disturbance was revealed through theoretical analysis,and the variation laws of the stress field and energy field of the triangular coal pillar under the influence of faults were studied through numerical simulation. The results show that the fault-type triangular coal pillar area is affected by the mutual superposition of the advance abutment pressure,the abutment pressure of the fault and the hanging roof pressure of the adjacent goaf,resulting in a high degree of stress concentration in the fault-type triangular coal pillar area. Under the action of fault barrier,the static load stress and accumulated elastic energy in the triangular coal pillar area increase with the decrease of the distance between the working face and the fault. When the working face is 150 m away from the fault,the static load stress and elastic energy in the triangular coal pillar area begin to rise,and reach the peak when it is 50 m away from the fault. The measures of blasting pressure relief and energy release of roof and coal in triangular coal pillar area are put forward,and the effect of pressure relief project is verified.