The sediment granularity, sporopollen and micropaleontology analysis of quaternary BZK02 bore (depth: 322.1 m, core-taking rate > 96%) of the south wing of Yangtze River delta has been carried out in this paper. It discusses the sporopollen assemblage, sedimentary environment evolution, sedimentary facies and paleoclimate characteristics revealed by bore since the Pliocene, and studies the quaternary stratigraphic division and paleoenvironment. The results showed that since the Pliocene, 133 species of sporopollen, 29 species of foraminifera, 7 genera and 8 species of foraminifera had been identified. Bore reveals that the lithologic quaternary strata are in turn the first member of Jiaxing formation (299.8-322.0m), the Jiaxing formation of early Pleistocene (160-299.8 m) and the Qiangang formation of middle Pleistocene (87.3-160.0m). The late Pleistocene Dongpu formation (72.0-87.3m), the late Pleistocene Ningbo formation (18.6-72.0 m) and the new Pleistocene Zhenhai formation (0-18.6 m). The evolution of paleoenvironment is mainly represented by residual slope, fluvial deposition and warm, cold and wet climate. In the early Pleistocene, fluvial facies and lacustrine facies were the main deposits, and the climate experienced two cycles of warm, humid, cold and dry changes. In the early middle Pleistocene, river-shore marine facies was deposited, the climate was warm and humid, the late period was dominated by fluvial and lacustrine facies, and the climate was warm, cool and dry. The late Pleistocene was dominated by river and lake, tidal flat and estuary sedimentary environment. The climate experienced warm and humid, warm and dry, warm and wet, cold and dry. The sedimentary environment of the Holocene is shallow sea facies, river and lake facies, lake and marsh facies, and the climate is dry and cold in the early stage and warm and dry in the late period.