Abstract: In order to solve the problem that it is difficult to determine the safety evaluation grade of flying gangue damage in steeply dipping coal seam, a safety evaluation model of flying gangue in steeply dipping coal seam is established by using the method of fuzzy comprehensive evaluation. Twenty factors of human, machine, environment and management are selected as the evaluation indexes. The weights are calculated by the combination of the index scaling method and analytic hierarchy process. The membership function is determined by the expert scoring method, and the safety evaluation is carried out by the fuzzy comprehensive evaluation method. The method is applied to evaluate the safety of flying gangue in 25221 working face of 2130 Coal Mine of Xinjiang Coking Coal Group in Aweiergou Mining Area. The test process verifies the feasibility and effectiveness of this method, and the method can be used as a basis for safety evaluation and protection of flying gangue in working face of steeply dipping coal seam.