Abstract: The stability control of gangue roof is one of the key technologies to be solved urgently in the safe mining of interbedded coal gangue roof face. In order to find out the effect of thickness gangue on ground pressure behavior of interbedded coal gangue roof face, the physical similarity simulation experiment method was used to study the roof failure migration law and abutment pressure distribution characteristics of different thickness conditions of gangue. The results show that when the thickness of the gangue layer is thinner, the collapse of the gangue layer is more fragmented after mining. When the thickness of the gangue layer is thicker, the collapse fragmentation of the gangue layer is larger. With the increase of the thickness of the gangue layer, the number of roof caving before the support decreases in turn, and the roof caving angle at the working face increases in turn. The periodic caving step is 14.7m in the stage without inclusion, which increases from 12.3m to 15.8m with the increase of thickness of inclusion. The peak abutment pressure and its influence range increase with the increase of the thickness of the gangue layer, and the distance between the peak abutment pressure and the working face decreases with the increase of the thickness of the gangue layer. The stability control measures of gangue layer roof, such as advancing support with contacting roof to control the stability of gangue roof and shallow truncation and deep Protection, are put forward to ensure the safe mining of interbedded coal gangue roof face.