In view of the complex live-line working condition on ultra high voltage DC transmission line

the fuzzy analytic hierarchy process（FAHP）is employed to establish a multi-level comprehensive safety evaluation indexes system for live-line working on ultra high voltage DC transmission line

including the factors such as liveline working environment

personnel quality

technical equipment condition and security management. On the basis of the indexes system

live-line working safety evaluation grade is determined

and the risk of live-line working on ultra high voltage DC transmission line is analyzed. This safety evaluation indexes system is applied to the Binjin ±800 kV ultra high voltage DC transmission line in Guizhou Province for live-line working safety evaluation

and the results show that the grade of live-line working safety is "relatively safe"

the main factor influencing the grade is the live-line working environment. This evaluation is in conformity with the conclusion of the safety inspection report

verifying the accuracy of the proposed multi-level comprehensive safety evaluation indexes system. This evaluation method provide the scientific basis for safety management of live-line working on±800 kV ultra high voltage DC transmission line.