Zooplankton in a newly-dug fish pond in the saline-alkali wetland in Yucheng County of Shandong Province from 1987-1989 was studied.During the 3 years, investigation the species of zooplankton were ascendant,the amount and the biomass were also.incremental.In 1987,1988 and 1989,the species of zooplankton were as follows; 29 species, 33 species and 52 species separately, the average amount of zooplankton:11911 ind/L, 39366.1 ind/L and 77889.2 ind/L, and the average biomass: 5.145mg/L, 5.7675mg/L and 9.6285mg/L.From 1988 to 1989, the peak amount of the zooplankton appeared in July.The successive increase in the species, the total amount and the biomass of the zooplankton during the three years showed the variation of eutrophication in the newly-dug fish pond.The amounts of protozoa had an obvious variation before and after fertilizing the fish pond.The increasing tendency of the amounts of zooplankton led to the conclusion that phytoplankton had equated the changes of the bacteria, showing that the protozoa were dependent on the phytoplankton but independent on the bacteria in the food chains.