The Tongji ditch and the Yongji ditch are two important constituents of the Sui-Dynasty Grand Canal,they had played the vital role in the Sui and Tang dynasties and even later successive dynasties.

• 通济渠和永济渠,作为隋朝大运河的重要组成部分,对隋唐乃至以后历朝,都发挥了重要的作用。