In order to eliminate the hidden danger of geological hazards of high and steep rock slope left by mining on the north side of Jinan Yanchishan, the comprehensive treatment was carried out with the technical methods of concrete base and concrete lattice beam construction, soft ecological bag masonry and mesh covering spray seeding, the vegetation coverage rate of the whole slope reached more than 99%, the visual pollution was vanished with the restoration of the ecological environment. The successful project design and construction practice could be good guidance and reference for the similar high and steep rock slope treatment.