Abstract: The engineering geological characteristics of the open pit slope of Wunugetushan Cu-Mo mine are analyzed in respect to the natural background conditions, structural types of rock mass, rock mechanics parameters, engineering geological petrofabric features, slope engineering geological zoning, slope stability evaluation, slope failure type and size. Calculation of the slope stability shows that the A-A' profile in A zone and the E-E' profile in C zone cannot reach the requirement of safety factor. The slope stabilities in other zones are well. At present, the open pit is under construction. The slope is in the process of stripping and formation, in which the geometric shape is well kept, with only local small-scale collapse, granular disintegration, wedged failure, ground fissures and atmospheric precipitation erosion. As of now, the slope is generally stable, without significant damage, which can basically represent the future slope failure type and stability state.