Abstract: Huang Juewan high-steep rock slope is composed by mudstone and sandstone. The rock beddings are similar to the cookies.They have soft and hard layers with gentle dip layered structure. The high-steep slope in addition to the top of the steep cliff in thick sandstone occurred collapses. Outside the instability main slope body bottom, there are local cutting layer instability. To ensure a smooth start of the lower part of high slope and the safety of the residents, this paper uses the method of numerical simulation on the high slope of the stability evaluation. The paper selects the natural dignity and seismicity load as the two conditions for slope stability analysis. The results show that:(1)Main slope rock mass in the two kinds of working conditions is still in the stable state; but seismic loads slope stability reduced significantly influence; (2)Steep cliff and main slope near the contact zone and the ramp slope foot place obvious stress concentration phenomenon more likely to damage; (3)the potential sliding surface of slope is located in the central slope. The cut points may be located at the slope toe.