Abstract: In 2018, the South-to-North Water Diversion Centre Line Project started ecological water replenishment of the Hutuo River and Fuyang River to repair the environmental environment of the rivers and lakes. To understand the current status of fish resources and their community relationships in the two rivers after the water replenishment, a fish resource survey was conducted on the Hutuo River and Fuyang River in Hebei Province in April, July, and October each year from 2021 to 2023, and the structure and diversity of fish communities in the two watersheds were investigated and comparative analyses, such as the similarity of the compartments, were carried out. The results showed that 32 species of fish of 26 genera in 5 orders and 10 families were collected from Hutuo River, and 36 species of fish of 30 genera in 5 orders and 10 families were collected from Fuyang River. The fish communities of both Hutuo River and Fuyang River were dominated by hydrostatic sedentary, sedentary viscous egg-laying, omnivorous, and benthic fishes. The dominant species were small fishes such as whelk Pseudorasbora parva and Hemiculter leucisculus, and the zonation was dominated by the fishes of the Chinese Plain Zonation Complex. The Margalef index of fish communities in Hutuo River and Fuyang River were 2.01-2.72 and 1.96-2.45, respectively; the Shannon-Wiener index was 2.61-3.29 and 2.29-2.83, respectively; and the Pielou index was 0.59-0.72 and 0.48-0.58, respectively. The fish in the Hutuo River and Fuyang River were diverse and richer and the similarity of community structure was higher, reflecting the common characteristics of the typical fish community structure of river plains in the Haihe River Basin. Continuous water replenishment and other ecological restoration measures have improved the water environment, protected and restored fish resources and diversity, and are of great significance to the environmental restoration of the wetlands of the two rivers.