Laoshan Bay is one of numerous gulfs of the Yellow Sea and an important fish enhancement and release area. It is vital for the Yellow Sea fishery resources that carry out proliferation and implement effective fisheries conservation and management in Laoshan Bay ecosystem. Based on bottom trawl survey conducted in Laoshan Bay in June and August 2014, the dominant fish species of fish community during summer were analyzed and their feeding ecology was studied by stable carbon and nitrogen isotopes method. The stable carbon isotope ratio (δ¹³C) is often used to assess basal sources in food web with a slight enrichment, while the stable nitrogen isotope ratio (δ¹⁵N) is indicator of trophic level, as a major increase with each trophic level. In terms of the index of relative importance (IRI), there were 10 dominant species of fish community in Laoshan Bay during summer, including Amblychaeturichthys hexanema, Ctenotrypauchen chinensis, Odontamblyopus rubicundus, Johnius belengerii, Argyrosomus argentatus, Lanmichthys polyactis, Chelidonichthys kumu, Cynoglossus joyneri, Clupanodon punctatus and Thrissa kammalensis. There were significant differences in dominant fish species composition of fish community between two months in summer. The range of δ¹³C of dominant fish species ranged from -20.66‰ to -17.53‰ in June and from -21.06‰ to -17.33‰ in August. There were significant differences in δ¹³C between dominant fish species. According to δ¹³C of this research, combining with results of stomach contents analysis, the results show that the main food source of fish community was benthic prey in June, but the food source of fish community was more extensive in August. The range of δ¹⁵N of dominant fish species was 10.86‰~15.47‰ in June and 9.40‰-13.10‰ in August. There were significant differences in δ¹⁵N between dominant fish species and the biggest difference were 4.61‰ and 3.70‰, respectively. The dominant species of fish community in Laoshan Bay in June included fish with middle trophic level and high trophic level, the mean trophic level of fish community was 3.90, and was mainly benthivores. The dominant species of fish community in Laoshan Bay in August included fish with middle trophic level and low trophic level, the mean trophic level of fish community was 3.37, including zooplankivores and benthivores, mainly benthivores. Linear regression analysis showed that in addition to J. belengerii, C. punctatus, C. joyneri and C. kumu, whose trophic level showed not linear correlation with the length, and the trophic level of rest of the dominant species was significantly positive correlation with the body length. This was mainly because with the increase of body length, they increase feeding on prey with high trophic level, but reduce feeding on prey with low trophic level, and their trophic level also increases.