Abstract: The fish resources in Haokun Lake National Wetland Park were investigated from July 2017 to July 2019. The results showed that there were total 56 species, belonging to 46 genera, 18 families and 5 orders. Among them, there were 40 species 5 families of Cypriniformes, 9 species 7 families of Perciformes, 5 species 4 families of Siluriformes, 1 species of Synbranchiformes and 1 species of Cyprinodontiformes. The D_G index, D_F index and D_G-F index of fish in the wetland park were 3.73, 5.44 and 0.315 respectively. Tilapia niloticus and Gambusia affinis are exotic species, and the other species were indigenous fishes. The fish distribution area of the Haokun Lake Wetland Park is divided into South China Community in South-East Subregionof East Asia region, which is mainly composed of Chinese plain faunal complex, South plain faunal complex, South mountain faunal complex, Early Neogene faunal complex, and a small amount of Central Asian mountain faunal complex fish. Cyprinus carpio, Ctenopharyngodon idella, Silurus asotus, Carassius auratus, Hypophthalmichthys molitrix, H. nobilis, Channa maculate, and Rectoris posehensis are common fishes in the lake. Semilabeo obscurus, Sinocyclocheilus lingyunensis, S. anatirostris and S. microphthalmus are rare fishes in the National Wetland Park. According to the characteristics of fish composition and fish index, some suggestions were put forward for the protection of fish diversity in wetland parky.