Abstract: In February 2021, two sections and four sampling sites were set up to collect sediment samples for the study of meiofauna composition, dominant genus (species) and feeding types of marine nematode in the mangrove wetland of Jinmen Island, Taiwan Province. Results showed that 10 meiofaunal assemblages were identified, including nematode, copepoda, oligochaeta, polychaeta, turbellaria, foraminifera, gastropod, cumacea, bivalve and tardigrada. Nematoda was the most dominant group, accounting for 93.93% of the total species. A total of 51 species or taxonomic entities of nematodes were identified, belonging to 31 genera, 15 families in 4 orders. On the section at site JH of Jiangongyu Island, 11 genera and 16 species were identified, and the dominant genera (percentage ≥5%) werePtycholaimellus, Viscosia, Daptonema, Dorylaimopsis, Parasphaerolaimus, Anoplostoma. And the dominant species were Ptycholaimellus sp.1, Viscosia sp.1, Daptonema ungula, Dorylaimopsis sp.1, Anoplostoma papaviviparum. Then, at site JM, 23 genera and 25 species were identified, and the dominant genera (percentage ≥5%) were Metachromadora, Daptonema, Viscosia, Ptycholaimellus, Dorylaimopsis. Among them, the dominant species were Metachromadora sp.1, Viscosia sp.1, Dorylaimopsis sp.1, Daptonema baihaijiaoensis and Ptycholaimellus ocellatus. Finally, at site JL, 18 genera and 30 species were identified, and the dominant genera (percentage≥5%) were Daptonema and Dorylaimopsis. With dominant species Daptonema quattuor, Daptonema setihyalocella, Viscosia sp.1, Daptonema baihaijiaoensis, Ptycholaimellus sp.1 and Spilophorella candida. Besides, on the section at site GH of Guningtou Island, 21 genera and 35 species were identified, and the dominant genera (percentage ≥5%) were Daptonema, Parasphaerolaimus, Ptycholaimellus, Viscosia and Ptycholaimellus, among then, the dominant species were Daptonema aquattuor, Daptonema setihyalocella, Viscosia sp.1, Daptonema baihaijiaoensis, Ptycholaimellus sp.1 and Spilophorella candida. From the perspective of community structure, only Daptonemawas found as common dominant genus at all 4 sampling sites with none of other common dominant species. In view of feeding type, the nematode community appeared at site in the middle tidal zone of Jiangongyu Island was only dominated by type 2A in contrast to the type 1B appearing only at the other three sampling sites. Therefore, most marine nematodes in this study are mainly feeders of non-selective sediments.