Abstract: Aiming at the phenomenon of support sliding, falling at 3313 fully mechanized mining face with large dip angle in Shitai Mine, through theoretical analysis, this paper studied the factors of fully mechanized face with large dip angle and provided control measures including oblique arrangement in working face, reasonable choosing support parameters, strengthening the management of roof and floor, properly controlling mining height and improving mining speed. The applied practices showed that the support system stability of 3313 working face is effectively controlled.