Abstract: Fluctuations in yearly numerical tendency of the Red Fox (Vulpes vulpes) in Heilongjiang province,China were analysed based on the fur purchase numbers during 13 years (1971-1983).Taking the interval between two peak years as a cycle,thenthere wer 4 cycles in Total Area (whole province) Analysis,the interval on average was 3-year,the coefficient of variation was 23.57%.The datas were also analysed by dividing the Total Area into eight Subdivisional Areas and the combining their cycles for further analysis.In Subdivisions Combination Analysis,totally 26 cycles were obtained,with a peak year appearing for every 3.42 years,the coefficient of variation was 39.78% Results of statistical testing ooth in Total Area and Subdivisions Combination analyses revealed that fluctuations in yearly numerical tendency of the Red Fox coincided with random fluctuations.Among causes which effected fluctuations the density of Red fox was not main factor.