Abstract: Based on the study of the relationship between the main occurrence factor of the faults in Jinchuan deposit area and the distribution law of structural stress field, the paper defines the destruction factor that characterizes the shearing sliding danger degree of the two sets of dominant joints of ore rock and wall rock, and analyzes the destruction factor of the two sets of along-vein dominant joints in the upper wall rock caused by the variation of the main stress direction.The calculation results indicate that in the east of the deposit area, F₁ joint plane occurrence is the main factor controlling the workings stability while in the west of the area, F₁₇ joint plane occurrence may become the main factor controlling the workings stability.The theoretical analysis results conform to those of the site monitoring of deformation destruction of along-vein workings.

Key words: Fault, Structural stress field, Along-vein workings, Stability