Abstract: The Jiao-Lai basin is a Late Cretaceous continental basin,which experienced complex tectonic deformation.Based on field observations of faults,combined with chronological age data and sedimentary sequences,the authors have established the Cretaceous history of formation and evolution of the Jiao-Lai basin.Generally,the formation and evolution of the basin experienced several tectonic deformation stages,of which two major deformation stages occurred in the Cretaceous :(1)During the early part of the Early Cretaceous ,the eastern Shandong area was controlled by the regional nearly E-W extensional stress field and extensive volcanic eruption took place in Jiao-Lai basin;the Dasheng Group was deposited in the intermittence of eruption.In the late part of the Early Cretaceous ,the Jiao-Lai basin experienced in-version of folding under the strong regional NW-SE compression.(2)In the early Late Cretaceous ,un-der the regional nearly N-S tensional stress,the Zhucheng down-faulted basin was developed,in which the Wangshi Group was deposited.In the late part of the Late Cretaceous ,the Jiao-Lai basin underwent regional NE-SW compression,resulting in folding of the Wangshi Group.