The North China block,the western portion of the Sino- Korean Craton,is rounded byYanshanian in the north and Qinling- Dabie orogenic belts in the south.The widespread de-velopment of extensional basins in thisblock indicates horizontal extension or continued thin-ning of a previousely thickened,unstable lithosphere throughout the Mesozoic.In this pa-per,we attempt to simulate numerically the geodynamical process of the basin formation byusing the mountain- basin evolution system.We assume thatthe formation of numeroussedi-mentary basins in the North China block is the resultofthe crustal extension,which destruc-ts rapidly the previously thickened crust.The gravitational collapse of the thickened crust ispossibly triggered by the re- orientation of the far- field stress regime,or the relaxation of theboundary resistantstress. The North China block, the western portion of Sino-Korean Craton, is rounded by Yanhanian in the north and Qinling- Dabie orogenic belts in the south. This widespread de- development of extensional basins in thisblock indicates horizontal extension or continued thin-ning of a previousely thickened, unstable lithosphere throughout the Mesozoic. in this pa-per, we attempt to simulate numerically the geodynamical process of the basin formation by using the mountain-basin evolution system. We assume that that formation of numerous sedi mentary basins in the North China block is the resultofthe crustal extension, which destruc-ts rapidly the previously thickened crust.The gravitational collapse of the thickened crust ispossibly triggered by the re- orientation of the far-field stress regime, or the relaxation of theboundary resistantstress.