七里海泻湖位于渤海湾的西北岸，是全新世晚期的一个半封闭泻湖。在其演变过程中至少经历过两次由泻湖──淡水湖──泻湖的过程。水体及湖体性质的变化决定于其是否与海连通及河流注入情况。近期，受人类经济活动及工程的影响，七里海泻湖生态系统遭到严重的破坏，并加速了泻湖的退化和消亡。 Located on the northwestern bank of the Bohai Bay, Qilihai Lagoon is a semi-enclosed lagoon in the late Holocene. During its evolution at least twice experienced by the lagoon ─ ─ freshwater lagoon ─ ─ process. The nature of the body of water and the change of the lake depends on whether it is connected with the sea and the river is infused. Recently, under the influence of human activities and projects, the Qilihai Lagoon ecosystem has been severely damaged and the degradation and demise of lagoons have been accelerated.