Abstract: In this poper the authors use the semivariance and the log-log semivariograms of Geostatistic to study the macrophytes community pattern in a bay (Huangfengkou region) of Baoan Lake. The spatial heterogeneity of the community and the species were quantitatively described at different scales by carrying out an investigation on lengthwise transect and transverse transect. The result showed that the spatial pattern of the community and the species had different fractal dimension values on different scales (variable h values). The fractal dimension values of those dominant macrophyte species to different h values are all greater than 1.5 and smaller than 2. On a scale of 400m, the fractal dimension on lengthwise transect was 1.8635, and it was 1.8220 on transverse transect. This indicated that the difference of spatial heterogeneity existed between two macrophyte communities, but their degrees were not high. The fractal dimension on lengthwise transect is smaller than that on transverse transect on same scale, which indicated that spatial heterogeneity on lengthwise transect is more complex than that on transverse transect. Because the macrophyte community showed a comparative high homogeneity on its pattern, the right scale should be about 520 meters when we carry out the community investigation, and the right scale for population sampling showd about 380 meters.