The meiofauna of Dongzhai Harbor Mangrove was investigated, and, chlorophyll a (Chla) and organic matter content of the sediments were determined, in April (spring), June (summer), and October (autumn) of 2015 and January (winter) of 2016.Furthermore, correlations between meiofauna abundance and Chla and organic matter were analyzed for different seasons. Results showed that the main meiofauna groups were Nematoda, Copepoda, Turbellaria, Polychaeta, and Oligocheata. Content of organic matter was 25.22%-93.41%, with an average value of 46.6%. Content of Chla was 0.188-6.303 μg/g, and the average content was 1.731 μg/g. Correlation analysis showed that there was a significant positive correlation between abundance of meiofauna and Chla content in spring (Pearson's r=0.684; P < 0.05). The abundance of meiofauna was negatively correlated with organic matter content in summer (Pearson's r=-0.518; P < 0.05).