This paper studied the dynamic variation of zooplankton population during the process of in-situ restoration of a heavily polluted tidal river in southern China by the technology of enhanced ecological floating bed (EEFB) and explored the changing characteristics of zooplankton community structure responding to the river water quality improvement.The results showed that the river water quality was improved after treated by EEFB,and the species of zooplankton increased from 5 to 49 and there occurred co-existence of multiple species instead of single pollution resistant species after implementing the restoration engineering.There was also a significant rise (P<0.01) of monthly zooplankton richness,namely,increasing from the lowest 1.22 ind./L to the highest 47.19 ind./L after the restoration work in the demonstration area comparing to the control area.The diversity index also achieved notable increase,of which Shannon-Wiener diversity index(H') and Margalef species richness index(D)increased from the original 1.27 and 2.22 to 1.62 and 3.12,respectively.In the demonstration area zooplankton diversity showed higher recovery ability than that in the control area which indicated that the employment of in-situ restoration technology of EEPB was effective in raising the ecological recovery efficiency of polluted water bodies.