Located in northern Chifeng, Inner Mongolia, the clastic sedimentary rocks of Lower Permian Yujiabeigou Formation is mainly distributed at the Inner Mongolia uplift in the northern margin of North China craton. These clastic sedimentary rocks are dominated by graywackes, and their source rocks have not been fully handling and sorting, with relatively low maturity. The results have shown that light and heavy rare earth elements differentiate distinctly, and that light rare earth elements are obvious enrichment while the heavy rare earth elements stay stable. The values of δEu vary from 0.72 to 0.99, show negative Eu anomalies particularly and are similar with NASC or PAAS distributing model, which suggest that these sediments are sourced from upper crust.