The electron capture timeseale may be shorter than hydrodynamic timescale in inner iron core of core-collapse supeova according to a recent new idea. Based on the new idea, this paper carries out a numerical simulation on supeova explosion for the progenitor model Wsl5M⊙. The numerical result shows that the size of proto-neutron star has a significant change (decrease about 20%), which may affects the propagation of the shock wave and the final explosion energy.