In response to the technical difficulties in the renovation of high-head ship locks using part of the original hydraulic structure,taking Hongjiang ship lock in Yuanshui River as an example,innovative measures such as model testing,comprehensive safety evaluation of the hub dam,optimization of the overall layout of the lock,reinforcement and renovation of old ship locks,and renovation of water conveyance systems are adopted to minimize adverse effects on hub power generation,dam safety,and flood control safety.This paper studies the three renovation schemes from the aspects of approach channel layout,navigation conditions,diversion buildings and the influence of the original lock structure,and determines the recommended scheme of lock expansion and renovation,which can provide reference for similar projects.