In order to make accurate evaluation of the operation mode of the distribution network, this paper proposes a variable weight evaluation method of the distribution network operation mode considering the index sensitivity. The evaluation indexes are analyzed using principal component analysis method, and the sensitivity weights are calculated using least square method according to the above results. Besides, the index data sequences and evaluation value sequences are analyzed using grey correlation analysis method in order to figure out the grey correlation weights. The sensitivity weights reflect the influence that the indexes and their values have on the evaluation results, while the grey correlation weights reflect the correlation degree between index data sequences and evaluation results. The comprehensive weights are figured out according to the variable weight formula. An urban distribution network is analyzed using this method, and the result proves the effectiveness and feasibility of this method.