Based on the data acquisitioned through the seasonal comprehensive survey of the marine ecosystem in Zhoushan Fishing Ground and its adjacent area (29 30′-31°30′ N, 121°30′-124°30′ E) in August 2006, January, April and November 2007, which stands for summer, winter, spring and autumn respectively, this paper discussed temporal\|spatial distribution of zooplankton abundance and Calanus sinicus, Euchaeta concinna, Sagitta bedoti and Sagitta enflata. The results showed that the seasonal variation in the mean abundance was remarkable, and the order from high to low is spring (555.87 ind/m3), summer (270.87 ind./m3), autumn (138.39ind./m3), and winter (127.70 ind./m3). Calanus sinicus is eurythermal and eurysaline species, it peaked in spring and uniformly distributed, and mean abundance in most of survey areas were over 100.00 ind./m3, It decreased dramatically in summer and mainly distributed in the area of south of 30°00′ N; It was lower in autumn and winter, and there was no dramatic high concentration districts. Euchaeta concinna is tropical species，whose abundance was higher in autumn and winter, and the concentration zone was located at the region of mixed water system; The distributable variation in the abundance was small but lower in spring and summer. Sagitta bedoti and Sagitta enflata were warm water species and oceanic water tropical species respectively, and their abundances were lower in winter and spring than those in summer and autumn. The high distribution area of Sagitta bedoti was observed in the large of salinity gradient of converged areas of warm current and the costal water system. High abundance of Sagitta enflata region appeared in convergence region of coastal current water and off seawater, especially in the side off seawater. Because of its distribution influenced by off\|sea high temperature and high salinity water masses, Sagitta enflata was a good indicator of warm current. Thermohaline and water system changes are important factors that affect the growth and decline of horizontal distribution of zooplankton abundance in Zhoushan fishing ground and its adjacent area.