Abstract: Based on the simulation experiment with similar material，with newly load on the surface increased at goaf with different angle，the variation laws of the extra subsidence on the surface and overlying strata above goaf were researched.The study shows that the extra subsidence of the surface after the newly increased load on the surface exist remarkable difference when the loading place is not simultaneous with relative location of worked- out area.The extra subsidence and inclined deformation on the surface is increasingly large when the location draws near to boundary of worked-out area.With the increase of load，extra subsidence on the surface of goaf increased linearly，and it always is less than one third of maximum subsidence or the 5% of minable coal thickness.The extra subsidence of the goaf with inclined coal seam is more than that with the horizontal coal seam，and the maximum extra subsidence of ground surface usually is on the down-up directions.With the increase of rock strata in depth，extra subsidence decreased linearly.The compaction of unconsolidated layers and the residual subsidence of the caving area are the key factors for the extra subsidence of goaf.

Key words: Similar material, Loads, Goaf, Extra subsidence