Abstract: The distribution pattern of D. angustifolia in the Sanjiang plain has been described by using the information dimension and Correlation dimension of fractal theory. The result reveals that: the information dimension respectively was 1.494、1.709、1.642、1.553 and 1.625. Complex spatial distribution has been described. The correlation dimension respectively was 1.662、1.861、1.766、1.750 and 1.807 from May to September. There was high degree of individual spatial relatedness, sharp intraspecific competition and powerfully occupy space. Seasonal dynamic of two dimensions reached their maximum values beginning May to June then fell down. They were gone up again in September.

Key words: Deyeuxia angustifolia population, distribution pattern, information dimension, correlation dimension