Aiming at the key problems such as severe overburden failure, unclear surface subsidence law and difficult control of surface collapse in fully mechanized caving mining of extra-thick coal seam, taking F6207 and F6211 working faces of Bulangou Coal mine as research objects, the vertical subsidence processing using TSX and Sentinel-1 data was carried out by multi-source observation fusion. The subsidence range of the working face is calculated by migration tracking, and the deformation field of the whole working face is obtained. Calculated according to the scope of the surface deformation range and underground mining based on InSAR Angle, the influences of multi-source monitoring short-term dynamic mining based on multiple information fusion technology of multidimensional surface subsidence monitoring system, break through the conventional single cloth surface movement observation data in "spot" or "line", the limitation of boundaries and accurately identify the subsidence area, The monitoring accuracy of surface residual deformation is effectively improved, and the problem of surface subsidence and overburden failure law measurement of extra-thick coal seam with high intensity mining in loess gully region is solved.