With the development of the research of global Cenozoic climate change, it’s crucial to understand the background of climate change prior to the Cenozoic, especially the Cretaceous climate which is characteristic of the \"greenhouse Earth\" alike present-day’s climate. The Cretaceous climate change has been attracting a magnitude of attention. After high-resolution sampling and measurement of the color of a set of the redlike nonmarine sediments of the Lower Hekou Group along the Bapanxia section in Lanzhou-Minhe Basin, the sequence of color variation between 140.66 -124.19 Ma was obtained. Analysis of the variation of color value linkage to the sedimentary environment and lithologies shows that the variation of the color was predominantly controlled by the weathering of the resource area and sedimentary environment. The level of brightness (L*) values is mainly related to the content of the calcium cement (the sediments are poor in the organic matter) and the redness and yellowness (a* and b*) to the content of the hematite. The stepwise variation of the color together with the sedimentary settings suggests that in the 140.66 - 124.19 Ma time window the climate has undertook three stages of the change of dry-wet, hot-warm, even it was warm and humid. i.e. the climate is relative hot and humid between 140.66 - 137.43 Ma, relative warm and humid between 137.43 - 127.41 Ma and relative dry and hot between 127.41 - 124.19 Ma. The climate transition is bounded by the rapid climate shift, and the initiation of this shift was approximately 1 - 1.3 Ma prior to the age observed from the record of the marine sediment.