Haoming Lake was formerly known as Xishuiyu Reservoir. It is surrounded by mountains on all sides and is adjacent to the Great Wall. It is formed by the collection of natural springs. The water quality reaches the national first-class standard, and is a water source for direct drinking. The lake covers 18.4 hectares, with an average depth of more than 10 meters and the deepest depth of more than 30 meters. With a wide water area, Haoming Lake is a place for water recreation activities in the scenic spot. When you take a boat trip on the lake, you can enjoy the landscape of mandarin ducks playing in the water. According to the observation of the National Bird Watching Association, the Lakeside Great Wall Scenic Area is the largest breeding base for wild mandarin ducks in Beijing. Every year around October 1, flocks of wild mandarin ducks inhabit the shores of Haoming Lake.

In addition, due to the good water quality, there are many wild fish in the lake, such as grass carp, carp and crucian carp. Because of the deep water, complicated terrain and obstacles such as boulders and dead trees at the bottom of the lake, it is also a hiding place for big fish. Visitors can enjoy fishing in the wild here.