In order to apply evaporative cooling technology to large capacity turbo generator,evaporative cooling technology of rotor needs thorough research.This paper introduces the simulating experiment of open channel evaporative cooling of turbo generator's rotor windings,stating the theory of experiment and construction of experimental model and acquiring of data,and analyzing the results in detail.The aim of experiment is to obtain the temperature distribution of open channel rotor winding.The results indicated an even temperature distribution in radial direction.That completely conformed with the cooling specification of turbo generator.Under different working conditions,the system showed great cooling ability.This experiment provided basis for the design and computation of large capacity turbo generators which adopted open channel evaporative cooling technology of rotor winding and had certain guiding significance to the next step of experimental work.This experiment also provided experimental basis to the research of fluid flow and heat transfer under centrifugal force.