【英文摘要】Based on the paleoceanographic studies of the pelagic sediment of ODP Site 807, which recoverd from the Ontong-Java plateau, a continuous stratigraphy of the western equatorial Pacific during the mid-Pleistocene was reconstructed. Our results implied that the final formation of the asymmetric East-West pattern in the equatorial Pacific was occurred at ~1.6 Ma B.P. and should be much more resulted from the vibrant subsurface water change, which was related to the deep water reorganization in the Southern Ocean. Analysis on the increasing sampling interval during the 600-1200 kyr B.P. in this core, with an average time resolution reached ~500 yr/sample, showed that the mid-Pleistocene transition was refleced not only by the periodicity changes on the orbital scale, but also by the variation character on the millennial scale. Moreover, the calculated SSTs derived from the Mg/Ca ratio of planktonic foraminiferal shells changed synchronously with the northern hemisphere ice sheet growth, which indicated that the rapid climate change in the tropical ocean had a teleconnection with the high latitude ice sheet volume. Our results further confirmed by the high resolution paleoceanograhic records at ODP Site 1144 in the South China Sea, including stable isotopes, Mg/Ca-derived SSTs, geochemical data from XRF core scanner, etc. All the results in this study would be helpful to better understand and give more evidence of the mid-Pleistocene transition and the tropical forcing in the global climate system..