Abstract: 123 high-resolution pollen records obtained from 837cm to 304cm of the Ha'ni Lake core in Jilin Province,Northeast China and 8 accurate AMS 14C dating data provided an opportunity to reconstruct the climatic change responded by vegetation evolution from 13.1cal.kaB.P.to 4.5cal.kaB.P.The evolution can be divided into the following stages:(1)13.1～11.9cal.kaB.P.At the very beginning the pollen percentage of trees which were mainly Betula,Pinus,and Picea was more than 50%,and herbs was 40%.The vegetation was sylvosteppe.The climate was cold and wet.From 12.8cal.kaB.P.to 12.1cal.kaB.P.,herbs expanded rapidly and dominated the area,indicating a dryer climate which may be part of the Younger Dryas event.At the end of this stage there was an appreciable increase of deciduous broad-leaved tree pollen percentages,showing a warming tendency.(2)11.9～10.0cal.kaB.P.A high volume of Picea and Abies pollen reflected that the vegetation changed into coniferous forest.The climate became cold and wet.(3)10.0～8.2cal.kaB.P.The percentage of broad-leaved deciduous trees increased gradually.The coniferous forest was gradually replaced by broad-leaved deciduous forest,which indicated a rapid rise of temperature.(4)8.2～4.5cal.kaB.P.Generally the broad-leaved deciduous tree pollen percentage was high(up to 80%)in this area,which indicated a wide spread of broad-leaved deciduous trees and amoderate and humid climate.However,the broad-leaved deciduous tree pollen percentage also decreased several times along with the increase of herbs and conifers during this period,showing climate fluctuations between cold and warm,dry and wet.There were four times low temperature fluctuations around 6.8cal.kaB.P.,6.1cal.kaB.P.,5.5cal.kaB.P.,and 4.7cal.kaB.P.As to spectrum analysis,there were quasi-periodic climate variations of 1100a,700a,500a,and 300a from 13.1cal.kaB.P.to 4.5cal.kaB.P.in the Ha'ni area.