Abstract: This paper present a treatment method of slope based on the EGMS (Engineering geomechanics meta-synthetic method) and characterization of the structure of natural rock mass on the left bank ship-lock slope of Wuqiangxi Hydropower Station. The author proposes a treatment solution that improves the slope stability by engineering disposal and local strengthening in addition to reducing or control external factors that causes deformation of the slope. Detailed monitoring results are also presented to demonstrate the effectiveness of the synthetic treatment. Such a successful treatment experience of the complicated slope provides a good example for engineers in the field of hydropower engineering.