Abstract: On the study on distributional characteristics of sporopollen assemblage and geochemical data at the late Cre- taceous period in Songliao basin,the paleoclimate was recov- ered.The result indicates that the palaeoclimate change is classified into two cycles.,from xerothermic to humit to xe- rothermic.The cycles above are well corresponding with the cycles of two secondary sequences interpreted from the li- thology,the electrical property and seismic data.The cyclic change of palaeoclimate results in the changes of lacustrine level and sediment supply,consequently affecting the devel- opment of lithologic sequence.The palaeoclimate change of each cycle affects the changes of the low-stand systems tract (LST),transgressive systems and high-stand systems tract (HST),and also controls the accumulation model of deposits and the distribution of sedimentary facies.