Abstract: It is always a difficulty for coal mine how the working face with fully mechanized top coal caving passes through the abandoned roadway.The dynamic behaviors of main roof of working face passing through abandoned roadway and the mechanical and deformation characteristics of high moisture quick setting backfill material are analysed.Successful practice shows the application of such backfill material to abandoned roadway is a good solution to ensure the working face pass through abandoned roadway quickly,safely and economically.