The Mesozoic—Cenozoic red bed strata in the Western Qinling Mountains and its adjacent area include the Cretaceous, Paleogene，Neogene. These different age red bed strata have different characteristics in sedimentary sequences, tectonic deformation, spatial distribution and geological relations, which are the objective records of the Mesozoic—Cenozoic intracontinental tectonic process of the Western Qinling Mountains. Therefore, regionally systematical study for those different age red bed strata is foundation for understanding Mesozoic—Cenozoic tectonic evolution of the Western Qinling Mountains and its adjacent areas. Based upon the unconformities between different red bed strata and underlying strata, distinct characteristics of those different red bed strata in sedimentary sequence, tectonic line and structural form, spatial distribution, Mesozoic—Cenozoic red bed strata in Western Qinling Mountains and its adjacent areas can be divided into three tectonic layers, that is, the early Cretaceous, late Cretaceous and Paleogene—Neogene. Although the nowadays spatially distribution of the three tectonic layers has been separated and dissected by the latest plateau uplift and erosion, the three different tectonic evolution stages of Mesozoic—Cenozoic tectonic evolutionin the Western Qinling Mountains and adjacent regions can still be determined. Three tectonic layers correspond to Early Cretaceous extensional rifting basin development stage, Late Cretaceous strike slipping pull apart depression stage and Oligocene—Pliocene regional depression basin development stage. In consideration of tectonic framework and lithosphere Dynamics process of Chinese continent after Indosinian collision orogeny, it is suggested that Early Cretaceous Northeast extensional rifting basin should be the part of Eastern Asian regional extension tectonic system formed by the westward subduction of Western Pacific plate to Eurasian plate since Mesozoic, Late Cretaceous strike slipping pull apart depression basin may be the result of left strike slipping of Northwest Chinese continent lead by collision between Lhasa block and Qiangtang—Changdu block during Cretaceous, and Oligocene—Pliocene extensive basin development probably indicates a long period of uniformly depression and plantation in which the remote tectono geomorphic response of the collision between Indian plate and Eurasian plate tectonic plate had not appeared. This shows that the Western Qinling Mountains had not become part of the Qinghai—Tibet Plateau before Pliocene era.