Abstract: Aiming at large inclination, large mining height and slow mining characteristics of fully mechanized coal face in the Fucheng Coal Mine, combining with the occurrence conditions of coal seam, combustion causes and treatment difficulties were analyzed, and fire area was controlled by closing working face and flooded cooling. The technologies of support rear polymer colloid injecting, upper and lower ends plugging and other effective after-combustion preventing measures were carried on to ensure the working face smoothly unsealed and safety production.