Abstract: Although prestressed anchoring beam is a new technique for rock slope reinforcement and has some functions, such as drainage, monitoring and reinforcement, which ordinary anchoring cavern hasn't, it still hasn't better design method now. In the paper, the author combined the method of imbalance thrust force with the design of prestressed structure to solve not only slope stability analysis affected by design load and prestressing force of prestressed anchoring beam but also the design strength of anchoring beam structure. The new technique provides a kind of design method to prestressed anchor beam and provides design basis for application of the new technique in the engineering project.