Grain size and AMS14C dating in the sediment of Kuroshio mainstream,eastern of Taiwan,were determined to investigate the sedimentary environmental change of the research area for the past millennium.It made use of total organic carbon(TOC)and carbon stable isotope compositions in organic matter(delta~(13)C)of sediments to estimate the sea-derived carbon contents.The change of marine primary productivity and the response of climate change in the research area for the past millennium were discussed based on the above study for the first time.The results showed that the sedimentary environment of the research area was relatively stable,with an average sedimentary rate of 34.44cm/ka.In addition,TOC and total nitrogen(TN)contents of the sediments in Kuroshio mainstream were mainly influenced by rivers input of eastern Taiwan,settlement process of marine primary productivity, diagenesis and grain-size effect.TOC of research area sediments was mainly marine autogenic and was minor terrigenous input based on the estimation result of sea-derived carbon contents,which is about 40.02%- 73.88%of organic matter in the sediments was marine autogenic.Meanwhile,the sedimentary records in Kuroshio mainstream for the past millennium well were reflected three climate periods,which is Medieval Warm Period (MWP),Little Ice Period(LIP)and Modern Period(MP).During 1150-1420,the contents of TOC,TN and sea-derived carbon of sediments in the research area were rising slowly,and the marine primary productivity was rising affected by the relatively high sea surface temperature(SST)in MWP.During 1500-1840,the difference of variation trend between TOC and sea-derived carbon contents reflected the temperature and rainfall features in LIA of the research area.On the one hand,relatively low sea-derived carbon contents and marine primary productivity were affected by relatively low SST and less Asian continental dust input during 1600-1750.Relatively high TOC contents in the research area sediments during 1500-1850was related to more sediment input,which was caused by increased rainfall of Taiwan in LIA and stronger rivers input of eastern Taiwan.In the MP,SST in the research area was gradually increased,but the intensity of the East Asian monsoon and the precipitation fluctuated rapidly, which is reflected in the rapid fluctuation of the median diameter(D50),TOC and TN contents during 1930-1950 and 1970.