Abstract: It is very necessary to determine reasonable reinforced area and no reinforced area in slope engineering. Design scheme is often verified and adjusted in the process of construction. The reinforcement demand degree analysis is a new method. It can combine major factors of affecting slope stability with actual displacement monitoring results at the site, and also can find adequate design results by expert experience and knowledge. This reinforcement demand degree analysis is applied to the slope stability on the right bank of a hydropower station. The analysis adopts affecting weight values, and reaches reinforcement demand degree for each part of the slope during the period of construction. The application has obtained the best results.