Abstract: From the point of view about sediment-structures evolution the uneven sediment-structure evolution movement-laws along north-south direction in Longxian region of southwestern Ordos Basin have been found with time clues,and by analyzing and comparing about the thickness of the initial formation and the residual of the Jurassic,Cretaceous and Paleogene system.Two advantaged coal-bearing districts in the north and south direction have been forecasted based on the analysis of structure coal-control action.It has been proved by followed seismic exploration.