Beiyao Site is situated in the third sequence of Chanhe River, one branch of Luohe River. In the course of archaeological excavations, the authors collected a set of loess samples with 10 cm spacing, measured magnetic susceptibility and grain size data in the Sedimentary Laboratory of Institute of Geology and Geophysics, Chinese Academy of Sciences. First of all, the magnetic susceptibility of Beiyao section has 3 peaks, which is respectively 169.8×10-8 m3/kg, 158×10-8 m3/kg and 224.5×10-8 m3/kg, There are also three peaks in Duanjiapo section and deep-sea oxygen isotope curve. Secondly, the morphology of Beiyao curve has two-peaks-three-valleys structure between the first and second peaks, second and third peaks. The same pattern is also present in Duanjipo section and marine isotope curve, so the authors can correspond three peaks respectively to S1, S2, S3 or Layer 2, 4, and 7 in field section.