The construction of China’s inland river locks in the central and eastern regions is a complex process due to factors such as topography,geological conditions,structural construction,and foundation seepage control.However,there is limited research on high steep slope support technology for locks rebuilt under these complex conditions.This paper focuses on the reconstruction of the Hongjiang hub lock project in Hunan province,which has a 27 m high head difference.It proposes a combination of support technology,namely “frame lattice beam + prestressed anchor cable,”to address the stability issues faced during high slope construction in a complex environment.The safety and stability of the high slope are analyzed through the deformation of the slope surface settlement and on-site testing of the anchor cable’s internal force.The effectiveness of the protection technology is evaluated.The research findings demonstrate that after the adoption of the support technology,the maximum daily settlement deformation of the high slope of the lock is 0.34 mm/d,and the maximum cumulative settlement is 8.3 mm,which is far less than the alarm value of 3 mm/d and 20 mm.The “frame lattice beam + prestressed anchorcable” combination primarily bears tensile force,which remains within the design limit of 1,000 kN.The support structure’s design layout for the high slope of the lock is reasonable,effectively preventing slope wedge slippage and ensuring the high slope’s safety and stability.The research results can provide reference for similar projects.