Abstract: The distribution charecteristics of Euglenophyta in the Jianghan Plain are summarized as follows: 1. The euglenoid distribution is extensive and the probability of euglenoid appearance is as high as 96.4％. 2. Analysis of variance showed no significant differences in euglenoid species abundance in the plankton samples collected from different localities F=1.01F0.05=2.41,df=(5,48), p>0.05. 3. The frequency distribution of euglenoid species abundance in water bodies is similar to a normal distribution (mean: μ=9.8; standard deviation:σ=5.2;X2 test: 0.10>P>0.05, df=3). The euglenoid species number in most water bodiesfalls within range 6-14. 4. The relationship between the euglenoid species number (N) and occurrence frequency (F) can be described by a power function: N=70.600F-1.437(r=-0.961, n=18, p0.001) This relationship suggests that only a small number of common species have wide distributions in the Jianghan Plain.