渭南阳郭黄土剖面是迄今发现的１５万年以来较完整的剖面之一。作者对阳郭剖面中的有机质指标进行了概率分布与谱分析计算，得出了它们的概率分布类型及四个稳定的周期：６７．１Ｋａ、３３．５Ｋａ、２５．２Ｋａ和１８．３Ｋａ。这四个周期与洛川黄土剖面中元素组分变化的短周期基本一致；与深海岩芯δ１８Ｏ值和地球轨道要素变化的短周期基本吻合，表明第四纪的气候变迁是受天文因素控制的。 The Weinan Yanguo loess profile is one of the more complete profiles discovered so far for 150,000 years. The author has carried on the probability distribution and the spectral analysis calculation to the organic matter index in Yang Guo section, obtains their probability distribution type and four stable periods: 67.1Ka, 33.5Ka, 25.2Ka and 18.3Ka. These four periods are basically the same as those of the elemental composition in the Luochuan loess section. They coincide with the δ18O value of the deep-sea core and the short period of the Earth’s orbital element changes, indicating that the Quaternary climate change is controlled by the astronomical factors .