Abstract: In this paper, a 7.88-m-thick section of lake sediments (89°53'E, 40°41'N)was discovered in the northern margin of Kongqi River, which is located at Tarim Town, Yuli County, eastern Xinjiang, northwestern China. From up to bottom, fourteen Electron Spin Resonance (ESR)ages were achieved, dated in 93±19 ka BP at 0.29 m, 200±25 ka BP at 0.89 m, 248±24 ka BP at 1.46 m, 278±40 ka BP at 2.28 m, 306±34 ka BP at 2.40 m, 325±32 ka BP at 3.14 m, 389±38 ka BP at 3.48 m, 410±55 ka BP at 4.03 m, 449±44 ka BP at 4.61 m, 530±53 ka BP at 5.12 m, 568±108 ka BP at 5.90 m, 638±63 ka BP at 6.55 m, 679±75 ka BP at 7.12 m, and 727±72 ka BP at 7.56 m. This data suggests that the section spans Mid-Pleistocene and a reliable chronological framework is established for this region. Meanwhile, sedimentation rate is calculated with ESR method. Results show that sedimentation rate presented long-term slow changes and short-term rapid changes, which fluctuated between 0.429 and 3.895 cm·ka^-1. And sedimentation rate increased gradually in fluctuations during 727-278 ka BP, while decreased periodically during 278-93 ka BP. The results underlie for the study of spatial distribution characteristics of sedimentation rate in mid-Pleistocene sedimentary strata and paleoclimate changes in this area. On this foundation, contrastively analysis of the sedimentation rate in mid-Pleistocene sedimentary strata and the Mid-Pleistocene climate of Lop Nor and its surrounding areas exposes that the sedimentation rate of LX01 section in the northern margin of the Kongqi River can reflect the climate change characteristics of Lop Nor during Mid-Pleistocene. Specific performances are:when the sedimentation gets high rate during the period of 278-200 ka BP, 306-325 ka BP, 389-410 ka BP, 530-568 ka BP and 638-679 ka BP, the climate show a humid-warm pattern; when the sedimentation gets low rate during the period of 93-200 ka BP, 278-306 ka BP, 325-389 ka BP, 410-530 ka BP, 568~638 ka BP and 679-727 ka BP, the climate show a dry-cold pattern.

Key words: Mid-Pleistocene, ESR, Sedimentation rate, Kongqi River, eastern Xinjiang