The benchmarking management method is widely used in power industry

but the conventional thermal power units benchmarking method has obvious limitations because of narrow index coverage

insufficient data utilization and other reasons. Therefore

this paper puts forward a method for benchmarking evaluation of the stability of coal-fired electric generator

and establishes a set of systems based on superheated steam system

reheated steam system

cold-end system

flue gas-air system and combustion system. Moreover

it calculates the weight distribution of each system according to analytic hierarchy process(AHP) method. The characteristic parameter subset of each subsystem is selected and graded according to the importance degree. Finally

the comprehensive benchmarking evaluation system for coal-fired power units is formed. By taking 14 units of a company as the examples

the operation stability index of unit is calculated

and the stability of each unit is evaluated and ranked by using the method of comprehensive benchmarking based on AHP method. The calculation results show that

the comprehensive alignment method studied in this paper has the characteristics of high efficiency

comprehensive evaluation and clear results

it has good effect in application of multiple units

which effectively reflects the stable operation of each unit and plays a positive role in improving the production and management level of coal-fired units.