A new method is mentioned in this paper for studying the animal population dynamics by means of fuzzy theory. The author attempts to proceed from uniform point of view about the population-size and spatial dynamics of the animal populations and takes the citrus red mite, Pamnychus dtri McG. as an example.If the population dynamics of the citri red mite may be depicted by the mean density (X) of the population, the index of patchiness (M/M) and the frequency of infested leaves (F), they are only the point se...