通过泥河湾盆地大道坡和洞沟两个剖面的古地磁和古气候学研究,对泥河湾组的时代和地层划分提出了新的认识.泥河湾组Ⅰ ,顶底分别距今约2.48Ma和3.40Ma,属上新世,可与黄土高原的红粘土层对比;泥河湾组Ⅱ段,距今2.48～0.97Ma,可与午城黄土对比;泥河弯组Ⅲ段,距今0.97～0.13 Ma,大致可与离石黄土对比.根据上述地层划分方案,建立了泥河湾组地层框架,并进而与其他剖面做了对比分析. Through the study of palaeomagnetic and paleoclimate of the two sections of avenues and ditches in the Nihewan Basin, a new understanding of the age and stratigraphic division of the Nihewan Formation is proposed. 2.48Ma and 3.40Ma, belonging to the Pliocene, which can be compared with the red clay layer in the Loess Plateau. The section II of the Nihewan Formation, dating from 2.48 to 0.97Ma, can be compared with the loess in the urban area; Now 0.97 ~ 0.13 Ma, which can be compared with feldspar.According to the stratigraphic division scheme, the stratigraphic framework of the Nihewan Formation is established and compared with other sections.