Abstract: Regarding the engineering problem of the stability of rock slopes in open-pit mines being affected by the coupling of joint parameters and bench slope angles，Using numerical simulation methods， the influence of joint angle，joint density，and bench slope angle on the stability of the slope was ex⁃ plored，the safety factor of the slope under different schemes was obtained，the degree of influence of joint parameters on slope instability was analyzed，and significance tests were conducted. The results show that joint density and joint angle are the determining factors of the slope failure mode. Regardless of the joint density level，the inclined-slope joint slope is mainly subject to sliding failure. In the low joint density con⁃ dition，the failure mode of the reverse-inclined joint slope is independent of the joint; in the high joint den⁃ sity condition，the failure mode of the reverse-inclined joint slope will change to overturning failure. Under the combined effect of multiple factors，the higher the joint density，the more significant the decrease in the slope safety factor caused by the increase in the bench slope angle; an increase in joint density will re⁃ duce the influence of the joint angle on the safety factor，and an increase in the bench slope angle will cause a more significant decrease in the safety factor of the reverse-inclined joint slope. The influence of the three factors on the stability of the rock slope in open-pit mines is from large to small in the order of joint density，bench slope angle，and joint angle.

Key words: joint characteristics, slope stability, bench slope angle, numerical simulation