In the study of the red stratum surrounding artesian wells in the Alashan region,it was found that the well water rich in Fe~(2+) gushed out of the surface and the Fe_2O_3 film was formed,and then the ferriferous film adsorbed on the surface of soil particles to generate the red soil stratum,indicating that soil reddening could be unrelated to climate change. In the upper mantle,there may be some groundwater channels in the high-conductivity and low-velocity layers. Fe~(2+),Mg~(2+),and other ions from FeO and MgO in the basalt were extracted by supercritical water ( SCW) and flowed upward to the surface. The deep groundwater circulation maintained the aeolian dusts continuous deposits on the Loess Plateau. Groundwater that infiltrated into the upper mantle lithospheric channels in an early period was heated to generate SCW,and Fe~(2+) was extracted from magmatic rock and flowed out of the ground. Oxidation reaction occurred between Fe~(2+) and oxygen in the air,and the Fe_2O_3 film was formed. The ferriferous film adsorbed on the particles to generate the red soil stratum. Over the 2. 5 million years,the temperature of groundwater channels was lower than the supercritical water point,the extraction effect was greatly weakened,and the aeolian soil became yellow,indicating that there was no relationship between climate change and the change of color of the Loess plateau. In addition,the global ice volume was positively correlated with delta~(18)O in deep sea sediments and negatively correlated with global precipitation,and the volume of deep groundwater circulation was positively correlated with global precipitation. Therefore,the contents of carbonate and total iron oxide in the loess deposits in Ordos had significantly negative correlation with delta~(18)O in deep sea sediments.