The resources status and species diversity of fish in Daiquyang were analyzed based on the data collected from the investigations from spring (May), summer (August) and autumn (November) in 2009 to winter (February) in 2010 by bottom trawl. There are three methods including sweep area method, biodiversity analysis and analysis of variance (ANOVA). The results showed that: A total of 38 species of fish were caught by bottom trawl, which belonged to 31 genera, of 21 families, 8 orders, 2 classes and 1 phylum. For percentage of number of species, biomass and number abundance density, warm temperature species all occupied the dominant position. Coilia mystus was the dominant species in all the seasons. On temporal distribution, both the biomass and the number abundance density in summer were the highest, but opposite in winter, and the biomas in summer was significantly different from that in winter (P<0.05), and same to the number abundance density (P<0.05). On spatial distribution, both the biomass and the number abundance density in northern area were higher than those in southern area, and those in the eastern were higher than those in the southern. By correlation test, the relationship between the biomass and average sea bottom water temperature can be denoted by binary curve (P<0.01). The Margalef richness index (D), Shannon-Wiener diversity index (H′) and Pielou evenness index (J′) in spring were significantly different from those in autumn (P<0.05). Compared with offshore water and deep sea in East China Sea, the Shannon-Wiener diversity index (H′) in Daiquyang was lower.