In the paper, according to the survey of catch in the set net along the southern coast of Zhejiang from July, 2010 to June, 2011, we conducted research and analysis on the distribution of six economic species of Coiliaspp larvae etc and the damage of set net on them. The results show that Coiliaspp larvae appeared mainly in June to September, the proportion of the sample weight were 3.17%, 3.60%, 1.44% and 2.63% in each month, average weight were 1.1 g, 2.2 g, 1.8 g and 3.9 g; Pampus argenteus larvae appeared mainly in May to June, the proportion of the sample weight were 0.39% and 3.58%, average weight were 0.5 g and 5.8 g; Collichthys lucidus larvae appeared mainly in June, the proportion of the sample weight was 2.27%, average weight was 1.5 g; Ilisha elongata larvae appeared in September alone, the proportion of the sample weight was 1.69%, average weight was 6.2 g; Portunus trituberculatus larvae appeared mainly in June and September, the weight of the sample P.trituberculatus proportion were 0.76% and 0.69%, average weight were 0.6 g and 0.9 g; Edible mantis shrimp larvae appeared mainly in the busy season from September to October, the proportion of the sample weight were 10.5% and 9.21%, average weight were 3.5 g and 4.8 g.