Macrobenthic species diversity in the waters surrounding Zhelin Bay was studied based on the quantitative data of macrobenthos sampled in February, May, August, and December 2013. The results show that 89 macrobenthic species were sampled in 2013. Mean Margalef richness index, Shannon-Wiener index, and Pielou evenness index val- ues were 1.73, 1.84, and 0.88, respectively. One-way analysis of variance showed that the richness, diversity, and even- ness indices were not significantly different among seasons. The k-dominance curve of abundance showed that the sea- sonal trend in species diversity was winter > spring ?autumn > summer. An R-type cluster analysis showed that the rich- ness, diversity, and evenness indices could be classified as a cluster. The correlations between the diversity index and richness index, the diversity index and species number, and the richness index and species number were relatively high. A Q-type cluster analysis showed that the 28 sampling stations could be classified into three or five clusters.