A total of 80 species of phytoplanktonic Chlorophyta.were collec:ted from the salt lake area in Yundieng, Shanxi Province, North China.Among them 5 genera 7taxa belong to Volvocales, 3 genera 3 taxa to Tet rasp or ales, 20 genera 51 taxa to Chlorococcales and 5 genera-19 taxa to Desmidiales-Concerning the salt concentration of the water, 4 types can be divided, i.e.fresh water (salt concentration 0.001%-0.05%), mesohalinous water (salt concentration d 05%-3%), euhalinous water (salt concentration 3%-4%) and polyhalinous water (salt concentration 4%-34.7%).Because of the effect of different saltc on cent ration the difference is evident in the distribution of phytoplank tonic Chlorophyta in 4 types of the water.It is shown that the higher salinity, the fewer number of species.