From April to December in 1988, 59 species of fishes were examined and 24 species of nematodes, belonging to 8 families, were collected and identified. Among two 24 species of nematodes, 5 species are new to science, diagnoses and descriptions of each new species are given diagnoses and descriptions of each new species are given as follows: 1. Rhabdochona onychostomi n. sp. 2. Rhabdochona brevichoni n. sp. 3. Spinitectus yuanjiangensis n. sp. 4. Spinitectus bagri n. sp. 5. Spinitectus wulingensis n. sp.