The reasonableness of the reinforcement and support scheme of high and steep slope formed by deep cutting of expressway, especially the large pile and slab wall structure which is costly and time-consuming, has always been a common concern in highway subgrade engineering. Taking the right deep cut slope of the K50+758.5~K50+850 section of Jianshui (Gejiu) to Yuanyang Expressway Project in Honghe Prefecture of Yunnan Province as the research object, using FLAC3D finite difference software, based on the strength reduction theory, combined with the normal, earthquake and rainstorm conditions of slope construction, By comparing the slope stability indexes before and after optimization, such as slope safety factor, maximum displacement of slope body, incremental cloud diagram of axial stress and shear strain of bolt (cable), the reinforcement design and analysis model of high cutting slope are optimized. The calculation and analysis show that THE reinforcement structure of pile slab wall can be cancelled, and the scheme meets the dual indexes of rationality and efficiency. Finally, combined with the stability monitoring data of slope body and reinforced structure, it is verified that the optimization scheme fits the low-carbon concept and has achieved significant economic benefits.