Abstract:According to the survey data of net catch in sampling along the southern coast of Zhejiang from July 2010 to June 2011, research and analysis on dominant species catch composition and seasonal distribution of swing net were conducted. The results show that, 97 kinds of swimming organisms were identified in the annual sample survey. Dominant species were Acetes Chinensis, Acetes Japanese, Bombay duck, Leptochela gracilis Stimpson, Coiliaspp, Charybdis bimaculata, Coilia nasua, and genera of Anchoviella commersonii, Gobiidae, genera of edible mantis shrimp, genera of Solenocera Melantho, Parapenaeopsis, Alpheus were in the 12 groups. Acetes were encountered throughout the year, there are two busy seasons, one is from March to May, the other is in July and August, the monthly gross Acetes weight proportion of the sample were 41.5%, 33.1%, 36.4%, 43.1% and 77.2%. Bombay duck appeared mainly in September to October, accounting of the weight of the sample in each month were 25.5% and 39.7%, average weight were 1.2 g and 1.1 g. Coiliaspp occurred mainly in June to September, accounting for 3.2%, 3.6%, 1.4% and 2.6% of the weight of the sample each month, average weight were 1.1 g, 2.2 g, 1.8 g and 3.9 g. Edible mantis shrimp appeared mainly in the busy season from September to October, accounting for 10.5% and 9.2% of the weight of the sample in each month, average weight were 3.5 g and 4.8 g.