The invention discloses a method for assessing the performance of an interruptible load participating in an electric system standby market. The method comprises the steps of determining an assessment index and establishing an analytical hierarchy structural model, establishing a pairwise comparison judgment matrix, conducting monolayer hierarchy ranking and consistency check, conducting consistency check of general hierarchy ranking, establishing an interruptible load selection evaluating model, and selecting the optimal interruptible load by means of the linear programming algorithm. Please see the abstract drawing for specific steps. By the adoption of the method, assessment of the performance of the interruptible load participating in the standby market is achieved for an electric power company in actual use, and users are encouraged to participate in demand side response.