Abstract: In this paper,based on the refined dynamic equation of plate bending,elastic wave scattering and dynamic stress concentrations in plates with a circular cutout were studied.Numerical results of dynamic moment concentration factors at the edge of cutouts in plates were obtained at given parameters by the Mindlin theory and the refined equation of plates,respectively.The comparison of the numerical results was made and discussed.It is shown that at a higher frequency,the numerical results,which are from the Mindlin theory and the refined theory,respectively,are different.Especially,as the cutout radius ratio to the thickness a/h is smaller 0.10,using the refined equation,the dynamic moment factor may approach to the maximum value,which is over 16% compared to that from Mindlin theory.The results are more accurate because the refined equation is derivative without using any engineering hypotheses.