Abstract: Based on an inclined 10° fault tip occurred in a coal mining process of a coal pillar coal mining face in seam island, in order to solve the coal wall spallin g, roof falling and other problems of the coal mining face, the paper studied the distribution features of the secondary stress field in front of the coal mining face affecte d to the coal mining operation.The extreme balance theory and the numerical calculation were applied to analyze the stress distribution law and the surrounding rock de formation features during the mining process of the coal mining face.The results showed that the concentrated stress of the powered supports in the coal mining face W ere mainly distributed in the middle and upward sections and low end of the coal mining face. The mining turbulence could cause a fault activation.And thus the vertical stress of the coal miming face near the fault would be reduced and the horizontal stress would be increased.The monitoring and measuring results showed that with the coal miming face continuously advanced forward, the pilot support pressure peak would be always at about 5 m in front of the coal mining face wall.