Leak detection and repair(LDAR)is a common international technical method for reduction of fugitive emissions of VOCs in petrochemical industry. Based on the LDAR verification of 60 sets of petrochemical chemical plants in Tianjin and expert advices,a comprehensive evaluation index system with 4 layers of 24 indexes was established by combining analytic hierarchy process(AHP)and fuzzy comprehensive evaluation method(FCE),in which the index weight is determined by AHP and the fuzzy comprehensive evaluation s...