Abstract: The Cretaceous continental strata developed in eastern Northeast China are rich in animal and plant fossils and have formed important minerals such as coal and oil shale. The only records of the earliest marine strata in Early Cretaceous are also preserved here besides Tibet, which is of great significance for the study on Cretaceous geography in China. Many new discoveries have been made in the Cretaceous stratigraphy of this area in recent years, some of which have filled the gaps of strata study in Northeast China. The paper also preliminarily discusses the co-evolution of Late Cretaceous flora and fauna represented by dinosaurs in the region.