The samples for this palynologlcal study were taken from a sedimentary deposit in the central part ot the Taipei Basin, According to the different sediments, 16 samples were chosen for study. (1936) and Day (1950. 1953). Pollen grains were extracted by chemical deflocculation by a modified Nakamura's method (1967), then permanent slides were prepared and scaled with paraffin. Based on the examination of all the permanent slides, a hypothesis was formulated for the successive series oi plant communities of the Taipei Basin based on the Sungshan Deposit from about 380.000 to 4,500 years B.P. as follow: Palmae, Cycadaceae, Cyperaceae of Tropical Bunny wet lands elements (43.5 m.)->Fagac«ae. Moraceac. Theacae, Elaeocarpaceae of Subtropical with increasing cool temperate forest elements (36.5-31.9 m.)->Aceraceae, Fagaceae, Theaceae, Aquiioliaceae, Bctulaceae and Elaeocarpaceae of Warm temperate forest (23.6-19.3 m.)->Betu-laceae, Cyperaceae oi Subtropical forest elements (16<6 aceae, Pinaeac. Juglandaceae and Trochodendraceae of Warm temperate forest (15.7-13.6 m.)->Fagaceae, Betulaceae, Myricaeae, Pinaceae ol Subtropical forest (11.5-9.3 m.)->Myricaceae, Elaeocarpaceae, Pinaceae, Betulaceae, Fagaceae of Subtropical forest elements (7.2-1 m.)