关键词: 多属性决策, 区间数, 区间理想点, 夹角度量, 相对贴近度

Abstract: A new method is proposed for interval multi-attribute decision-making，in which the attribute values are in the form of interval numbers.The concepts of interval ideal point and inclination of each alternative on the interval ideal point are defined.The method uses the inclination to define the relative closeness between decision alternative and ideal point.The priority is given by the relative closeness.This method can avoid comparing and ranking interval numbers.It is straightforward and can be performed on computer easily.Finally，an illustrative example is given to demonstrate the feasibility and practicability of the proposed method.

Key words: multi-attribute decision-making, interval number, interval ideal point, inclination measurement, relative closeness