Abstract:The investigations on chlorophyll a of the water body, sediment, sediment water interface were carried out in Fuxian Lake of Yunnan Province from May to September 2001. We have also analyzed the distribution of dominant species and cell density of phytoplankton, the spatial and temporal variation of chlorophyll a and its relationship with environmental factors. Chlorophyll a was extracted and measured according to procedures of UNESCO‘s spectrometer methods under 750nm, 664nm, 647nm, and 630nm wavelengths. ...