The concept of repeated multiple blackouts is introduced. The power outage data of information systems of 95598 power outage complaint recording

distribution network repair and management platform

and distribution network operation and monitoring platform are summarized and analyzed

and the actual investigation work is carried out. The common reasons of repeated multiple blackouts of distribution network are summarized

and the influence factor indexes are given for each reason to measure the probability of the repeated multiple blackouts. The index evaluation system is established by fuzzy AHP（ Analytic Hierarchy Process） to evaluate the probability of the repeated multiple blackouts from three aspects

i.e. equipped level

operation and maintenance level

and grid structure level. The risk assessment of repeated multiple blackouts is carried out for an actual power outage case

and the comprehensive probability is obtained.