Abstract: The ideal indexes to analyze paleoenvironment that reflect the environmental changes are the abundance and variation of differentiation degree of ostracods in the strata. If the climatic environment is warm and the temperature and depth of water are suitable，the abundance and variation of differentiation degree of ostracods are higher. On the contrary，if the climatic is cold and the environment of the water is bad，the abundance and variation of differentiation degree of ostracods are lower. Besides，some ostracods themselves are good facies fossil，for example，some ostracods are halo tolerant，some are euryhaline and some ostracods could not live in salt water. Therefore，on the basis of the distribution features of the ostracods in the stratigraphic section the conjecture to sedimentary environment of the time is viable. Through the analysis of ostracoda distribution and combination feature in Lop Nor stratigraphic section，in the stratigraphic section found 14 Genus 31 species of ostracoda fossils，divided into two fossil assemblage zones. The first zone is characterized by Limnocythere sanciti-patricii，representatives of the lacustrine sedimentary environment. According to ¹⁴C age，the age of this zone is deposited in 20 870-14 770 a BP. The second zone is characterized by Cyprideis littoralis-Darwinula stevensoni，representatives of salt water-brackish lake sedimentary environment. According to ¹⁴C dating，the age of this zone is about 30 000 a BP. 搜索 #zCugEpngjSTips { Z-INDEX: 999999999; POSITION: absolute; WIDTH: 56px; HEIGHT: 24px; LEFT: 1342177.27em } #zCugEpngjSTips A { POSITION: relative; LINE-HEIGHT: 24px; MARGIN: -32px 0px 0px; PADDING-LEFT: 23px; WIDTH: auto; DISPLAY: block; BACKGROUND: url(http://mat1.gtimg.com/www/sogou/sogou_tips_v1.png) no-repeat 0px 0px; HEIGHT: 24px; COLOR: #000; FONT-SIZE: 12px; TEXT-DECORATION: none } #zCugEpngjSTips A:hover { BACKGROUND-POSITION: 0px -34px; COLOR: #45a1ea }

Key words: Lop Nor, late quaternary system, Ostracoda, environmental information