The influence of intensive electron beam in the chamber of electron microscope on the agglomerates, chain aggregates of WO₃ and MoO₃ nanopatricles and the rod shaped nanocrystals of these compounds is investigated.
   The ejection of WO₃ and MoO₃ nanoparticles from agglomerates and rod shaped nanocrystals is discovered that is bound up with their heating and electrization by electron beam.
   The studied nanostructures display the stability of different extent in regard to electron irradiation depending on the features of spatial assembling.