Canada Basin in Arctic ocean is the mainly sedimentary aera of ice-rafted debris transported from Laurentide ice sheet (LIS). However, the basin also received IRD transported from the Eurasian continental shelves (EACS). Therefore, distinguishing LIS-source from EACS-source is the key to study the expansion history of Laurentide ice sheet. In this project, we take two sediment cores in the Canada Basin as objects. Data for mineralogy, petrologic and isotopic geochemistry can be used as indicating the material sources for IRD with the grain size of ＞63μm and quantitatively calculating the respective contributions of different sources. The age scales for these two cores were constructed by the following three different means, i.e., AMS14C dating, paleomagnetic method, and sediment color reflectance.On the basis of above studies, variations in LIS-source IRD contributions with time can be used to infer individual ice sheet growth, variability and decline of LIS. This study attempts to reveals the relationship between glacial/interglacial regimes, abrupt climate change events and evolutionary history of LIS through comprehensive studies.