Chlorophyll a of eight sampling sites from Jiuduansha Wetland was investigated from 2010 to 2011, and spatial and temporal pattern of primary productivity calculated based on chlorophyll a was also analyzed in the present study. Highest concentration of chlorophyll a was detected in spring with the mean of 5.90 mg/m³, and appeared in tidal creek between Shangsha and Zhongsha. Chlorophyll a in autumn 5.03 mg/m³ was lower than that in spring, however, spatial difference was low. Chlorophyll a was very low in other seasons. Primary productivity in Jiuduansha Wetland was in the range of 87.75 -744.79 mgC/(m²·d), and the highest value appeared in the Xiasha and the lowest in Jiangyanansha. Chlorophyll a and primary productivity in Jiuduansha were not high compared with those values in other waters, which might be closely related to the high content of suspended solids in Yangtze River estuary. Moreover, significant correlation between chlorophyll a and primary productivity and TP indicated that Jiuduansha wetland might be phosphorus-limited waters.