Aimed at the air-raid target threat，the index system of the threat evaluation, quantified and indexed by the fuzzy membership function, is given based on the guideline of the threat evaluation. Usually in threat evaluation, only the information provided by the maximum is taken into account and the general values are ignored, which will bring distortion into existence. So, in this situation, it is more meaningful and significant to adopt interval-number in expression. In view of the judgment problem of the air-raid target threat, the criterion for the judgment of the air-raid target threat is analyzed and the main factors effecting on the target threat are given based on this. Then, by combining the interval number with the Grey relationship grade theory, a new multi-objective decision-making model is constructed and applied to the threat sequence of the air-raid target, which can more accurately reflect the influence of target maneuver on threat degree. In this way, the non-chief factors in the system are also taken into account，which makes the threat evaluation closer to the actual combat. Finally the model is applied to the air-raid target threat sequence, and the example shows that this method is feasible.