“引河沟灌大梁”是中国古代军事史上著名的水攻战例,也是开封城市生命第一个周期由盛转衰的关键节点事件,对开封城市发展影响深远。此次水攻,文献记载极其简略,前贤关注不够。本文在复原大梁城城墙和城门的基础上,再将王贲“引灌”前后大梁附近河道的变化呈现出来,依此反推出王贲灌大梁城时的引水地点和筑坝方式。 “The leading river gully irrigation girder” is a famous example of water attack in ancient Chinese military history and is also a key node event of the first cycle of urban life in Kaifeng, which has a far-reaching impact on the urban development of Kaifeng. The water attack, the documentary is extremely simple, the former Yin attention is not enough. Based on the restoration of the city wall and the gate of the girder, the paper presents the changes of the river near the girders before and after Wang Ben ’s “Diverting Irrigation ”.