The chlorophyll of phytoplankton in saline-alkaline ponds in Zhaodi an Fish Farm (Latitude 37°17'N,Longitude 117°55'E), Gaoqing County, Shandong Province, during April 1997 to September 1998, was measured.319 samples were collected.The results indicated that the mean concentration of chlorophyll in experimental ponds were 115.12μ g° L^-1, mean concentration of chlorophyll-a were 79.90(μ g° L^-1.The percentage of the content of Chla, Chlb and Chlc to total concentration of chlorophyll was 61.76%, 12.97% and 25.2%, respectively.The concentrations of Chla had obvious seasonal dynamics, and have a peak value in summer and early autumn.The concentratio nof Chla in control ponds was much smaller than that fish-culture ponds.The temporary and spatial changes of Chla were greater, but the pattern of dynamics is not unit.The concentration of Chla in experimental ponds have significant positive correlation to the biomass of phy to plankton, water temperature, total nitrogen, total phosphorus and silicon, and negative correlation to water transparency.No regular correlation of Chla concentration to salinity, alkalinity, pH, hardness and conductivity is found.