The species composition and seasonal succession of zooplankton in saline..alkaline ponds in Zhaodian Fish Farm, Gaoqing County, Shandong Province, from 5 April in 1997 to 1 September in 1998, were studied. The results indicated that salinity ranged from 1 . 36 to 20 g ..L- 1 , total alkalinity changed from 2. 4 to 7. 2 mmol..L- 1 , pH changed f rom 8 to 9, the zooplankton in saline..alkaline ponds were composed by freshwater salt.. tolerance species or halophile species, and some of them were halobiont species and which usually occurs in f reshwater. Dominant species of zooplankton were Askenasia volvox , Didinium nasutum, Lagynophrya conif era, Cyclidium citrullus, Strobilidium gyrans and Prorodon viridis ( Protozoa ) ; Brachionus plicatilis, Trichocerca pusilla, Brachionus calycif lorus , B . angularis, B . urceus, Asplanchna brightwelli , Proales simplex , Filinia cornuta and Polyarthra trigla ( Rotatoria ) ; Moina micrura, Diaphanosoma leuchtenbergiatum ( Cladocerans) ; Sinocalarus tenellus, Cyclops vicinus , Thermocyclops taihokuensis ( Copepod) . The biomass of zooplankton in the control ponds and new ponds were higher than that in other fish..culture ponds.