Combined pile-anchor supporting system with small diameter anti-slide pile and anchor rod was adopted for slope reinforcement in Shilong power station of Songjianghe, which replaced simple large diameter anti-slide pile and realized the application of large equipment in steep slope. Borehole collapsing and water as circulating medium in artificial backfilled stone layer were solved by DTH hammer drilling technology. The paper introduced the slope reinforcement scheme and construction technology in Shilong power station of Songjianghe.