Abstract:The low-pass, band-pass and high-pass digital filtering methods were adopted to study the periodical fluctuations of vegetation in accordance with the pollen spore series of No. 1 borehole in Kunming Basin. The result showed that there were obviously 4 periods in vegeiation succession: the long period was 1–1.4 million years; the middle period was 0.25–0.31 million years; the short period was 97–12 and 48–63 thousand years. The three-pass filtering curves showed the information of geological dating, stage and pattern of vegetation succession. This paper presents a good contrast with the three-pass filtering curves, climatic fluctuation, O isotope in deep sea and the earth’s orbit eccentricity. The result is satisfactory. The paleoclimatic analysis and the geological dating methods, based on the quantitative analysis, are used to discuss the paleovegetation succession, stage and pattern as well as the fluctuation of the pollen time series and the climate cyclic variation and to present the succession of the climatic variation in the Quaternary. The succession contains two climatic cycles, each for more than 1 million yrs., ten climatic periods, each for 0.25–0.3 million yrs., and 25 climatic fluctuations, each for 97–125 thousand yrs. It is considered that the geological and climatic information can be validly extracted by means of the method of the digital filtering from the pollen spore succession; thereupon we may deduce the succesional trend and progress of the paleovegetation that reflects the flutuations of the paleoclimate and the geographical conditions.