Grain-size composition of lacuslrine sediment is a powerful indioalor to water impelus change and humi(i variation in ihe history. Based on the analyses on ihe grain-size composition characteristics of JPH-1 core,from Lake Jingpo, norlh eastern of China, combined with 14 C age sequence, ihe Holocene hist or) of paleo-preripilation changes in this region can be concluded as below:(1)9300-8540 cat aBP was a relatively dry period acromf)a-nied wilh less preripilation. (2) 8540-6350 cal aBP was a high lake level period, when the precipitation was relatively abundanlo. (3) 6350 -4800 cal aBP, the climate became drought graduaHy. (4) 4800 -3120 ral aBP, the climate changed wel again. (5) 3120-1580 cal aBP was a relatively slable period maintained a high lake level wilh abundant precipitation. (6) 1580 t.al aBP-present, il was an another climalioally oscillation f>eriod in which the precipitation has been changing frequently. In recent cenluries,the human activities, such as i leariiig the forest, destroying the original vegetation in lake watershed resulted in massive exposure of land surface, remarkable increase of erosion and more terrestrial maleriel carried into lake. Therefore, the portion of coarser particles increased markedly.