A preliminary attempt was made to reconstruct climatic conditions in the Ningbo Coastal Plain, Zhejiang Province, based on microfossil analysis of a core drilled on the southern coast of Hangzhou Bay, Bast China Sea. Reaults of analysis show that spores and pollens are rich in the middle and upper parts but scarce in the lower part, and nine sporo-pollen zones are distinguishable from the Upper Pleistocene upwards. Changes in the feature of sporo-pollen assemblages indicate Pleistocene climatic fluctuations and suggest three cool periods, the late Middle Pleistocene, the early and late Late Pleistocene (Q23, Q31 and Q33).During the late Late Pleistocene, which was synchronous with the Dali Glacial Age, the temperature was about 10°C lower than that of today and the weather was not very cold in comparison with that of the innerland, suggesting that this area might have had been in the frontal zone of the glacial borderland. In contrast, the early and the middle Late Pleistocene (Q31 and Q32), and the Holocene were three warmer periods. However, the Holocene can be subdivided into four subperiods. The middle Holocene climate was relatively damper and hotter, with the temperature 1-2°C higher than today. The climatic fluctuations brought about changes in the nature of the vegetation. In the cold weather of the Late Pleistocene,cold-tolerant types such as Abies, Picea and Larix flourished in the conifer-broadleaf forest and forest-grassland. In the ajacent mountain region existed a small tract of Abies beshanzuensis, just like that thriving today in Qingyun County, southern Zhejiang. The middle Holocene found many kinds of evergreens and broadleaf species, such as Quercus glauca and Castanopsis, etc, but less in quantity, indicating that the climate then had been comparatively sultry. The three layers of marine sediments recorded the three transgressions on the Ningbo Plain. The whole area was under the influence of the Holocene transgression,which might have been a little earlier (about 7000-8000 yrs BP)than that happening on the northern part of China coast. The sediments deposited during the two upper Pleistocene transgressions, however, were not so typically marine as the Holocene. The latter two transgressions influenced only the northern and middle parts of the plain. The crustal oscillations of the area investigated are different from those of the Shanghai area and of the coastal plain on the west of the Bohai Sea but are comparable to those happening on the southern coast of the Haizhou Bay. The difference might be attributed to changes in the sea level, in the original topography and in the geomorphological movements,etc.