According to the characteristics of the climate change, the red beds from the Es4-1—Ek1 (the Lower Sub-Member of the 4th Member, Shahejie Formation, to the 1st Member, Kongdian Formation, Eocene) in Dongying Depression are availably divided, which have not been divided for a long time because of lacking referential fossils. The relative climate change is recovered based on logging data in combination with the relative content of Ephedripites. At first, according to the relative content of Ephedripites, the depth section of the inflection point of the climate change is defined. Then, based on continuous clay mineral contents which are determined by natural gamma ray spectrometry log data or conventional log data, the concrete depth of the inflection point of the climate is thereby defined, which is recognized as the boundary in the red beds. By the model which from standard well log data, red beds in other new wells nearby can also be divided. The scientific and rational method has been proved by afterward exploration. This method provides a new thought in dividing the fossil barren beds.