Abstract: In order to strengthen the control of timbering state in large inclined angel fully-mechanized face,decrease the problems containing accidents,production halts and output reduction caused by timbering collapsed in working face.Through the theoretical analysis,combined with the construction experience,Panbei coal mine summarized the prevention methods and treatment measures of timbering collapsed accidents in large inclined angel fully-mechanized face.The methods applied in the field,and achieved good economic and social benefits.