Abstract: To improve the dust removal efficiency and internal flow field distribution of wide-angle electrostatic-bag precipitators, simulation tests were conducted on the combination mode of perforated plates with different porosities. Results show that the relative velocity of inlet cross section was reduced from 84% to 21%, while the relative velocity deviation of measured cross-section met relevant standard requirements; the flow field distribution in an electrostatic-bag precipitator could be adjusted by adopting the combination of different non-uniformly perforated plates, thus to elongate the service life of the bag filter, reduce the maintenance cost and improve the dust removal efficiency of the composite precipitator.