The ruins of Chengzi Houshan City are located on the top of a mountain 3 kilometers northeast of Diaoshuilou Waterfall in jingpo Lake World Geopark. It is an ancient city from the Eastern Xia Kingdom. The ancient city wall was built according to the mountains, with a circumference of about 3 kilometers. Relics such as gray pottery shards and stone mortars can be seen on the surface. According to the "Ning'an County Chronicle", iron tools and copper seals were unearthed. The handle of the seal is engraved with "Made in the 18th year of Tiantai" and is a bronze seal of the Eastern Xia Dynasty.