  In frames of agreement to consider the annihilation of electron-positron pair
to hadrons cross section to be including the virtual photon polarization
effects a new formulation of hadron contribution to muon anomalous magnetic
moment is suggested. It consists in using the experimentally observed cross
section converted with the known kernels. The lowest order kernel remains to be
the same but some modification of radiative corrected kernel is needed. The
explicit form of this new kernel is given.
  We estimate the accuracy of new formulation on the level \delta
a^{hadr}_\mu/a^{hadr}_\mu \sim 10^{-5}.
