By analyzing the effect of groundwater on rock bedded slope

the hydraulic pressure model of rock bedded slope in both cases that the outflow seam is blocked or not are established. Then the slope stability is presented and organized into a dimensionless （Q、P、S）form of expression; curve of relationship between geometric elements and dimensionless variables（Q、P、S）is drawn when the splay fracture in the tailing edge of slope is filled with water

which can bring convenience for analyzing the influence of different geometric elements

water depth

different shear strengths of rock mass on the stability of the slope. By using the relation curve

the effect mechanism of hydraulic pressure on actual bedding rock slope stability is discussed. It is shown that: the effect of hydraulic pressure on slope stability is considerably significant. For example

the safety factor is reduced by 33.33% owing to the effect of hydraulic pressure in the case of the outflow seam unblocked

which is the main external factors triggering the failure of bedding slope；and the safety factor on rock bedded slope in the case of the outflow seam is blocked reduced by about 0.458 than that the outflow seam isn't blocked. The results can provide an important guide to engineering design and construction of rock bedded slope.