To clarify the annual changes of fish larvae and juveniles resource, monthly collections were held by a larva net in the north of Hangzhou Bay from June in 2014 to May in 2015. There were 10 sampling stations in this study. A total of 96 118 individuals were caught which belonged to 23 families and 55 species.The average density was 0.79ind./m³. 46 common species occurred in both years, while the abundance, species richness and average density were lower in 2014-2015. Tridentiger barbatus, Collichthys lucidus and Coilia mystus predominated in both two years. Development stage showed a similar tendency and pre-flexion larvae were dominant in 2 years. The density was significantly different(P<0.05) among stations and not significantly different(P>0.05) among months. The number of Margalef richness index(D) demonstrated distinct seasonal variations:they were higher in summer and lower in winter.The results of Margalef richness index(D), Shannon-Wiener diversity index(H') and Pielou evenness index(J') in summer of this research were higher than in 2013.