The composition and spatiotemporal dynamics of dominants within fish community in Bohai Sea system were analyzed using comprehensive data sampled in two 10-year towing periods, in order to determine the succession pattern of community and the responsive mechanism contributing to the sustainability of biological production. The 119 fish in the 1982-1985, dataset were comprised of 69 warm temperate species (57.98%), 34 warm water species (28.57%) and 16 cold temperate species (13.45%). Among these components, 31 species comprised to 53.834 thousand individuals per square kilometers in NED and 792.048 kg/km2 in BED, were determined as important fish judged by Pinaka's IRI (Index of Relative Importance), which related to the number, biomass and occurrence frequency for each species in the first sample period. Half-mouth anchovies, Setipinna taty, Japanese herring, Engraulis japonicus, spot croaker, Collichthys nivealus, and small yellow croaker, Pseudosciaena polyactics, were among the 4 dominants. Seasonal trend was shown up a single cycle around the year and the persistence measured in ISTR (index of species turnover rates) was 0.6792 between seasons. Compared with two 10-year data by same gear, community diversity during 1992 and 2000, had decreased in some aspects, such as species number, NED, BED by 38.66%, 35.46% and 46.1%, respectively. Correspondingly, seasonal persistence also decreased to 0.5902, showing that sustainability of fisheries productivity in the system is characterized by tending toward short age, weaker ecotrophic dynamics and fast turnover rate in production.