Abstract: According to the acoustic survey and bottom trawl of fishery resources in Nansha area (4°N~6°N) in 2013, we estimated the stocks and species composition of fishery resources in spring (March to April), summer (June to July), autumn (September to Ocotober) and winter (November to December) in southern continental shelf of Nansha area. The results show that the estimated biomass density (X ±SD) and stocks of 146 species in spring were (11.10±14.43) t · nmile^-2 and 3.64×10⁵ t, respectively. The estimated biomass density and stocks of 121 species in summer were (19.60±21.46) t · nmile^-2 and 4.85×10⁵ t, respectively. The estimated biomass density and stocks of 77 species in autumn were (8.70±3.87) t · nmile^-2 and 2.23×10⁵ t, respectively. The estimated biomass density and stocks of 60 species in winter were (11.91±11.44) t · nmile^-2 and 2.13×10⁵ t, respectively. Priacanthus macracanthus was the most abundant commercial fish in weight and its percentage to total catch was more than 30% in four seasons. Additionally, we analyzed the spatial distribution and seasonal variation of stocks of the species.