Loess layers with varying thickness are distributed broadly on the terraces and piedmonts of the Dasha River and a small tributary of the lower reaches of the Yellow River.The material sources are complicated, including materials transported by northwestern current and maybe eastern Bohai Bay current and the local pluvial sediments. Based on the characters of water erosion and rock clast，the Zhangxia loess is possibally a product of aeolian-pluvial-alluvial process.The development of the Zhangxia loess accords with the climate changes during the Late Pleistocene that are documented by previous studies.