In　the　beginning　of　magnetic　insulated　period,　loss　electron　in　coaxial　vacuum　magnetically　insulated　transmission　line(MITL)　strikes　anode　and　the　bremsstrahlung　photons　are　generated　in　the　mean　time.　Based　on　the　self-limited　flow　model,　velocity　in　direction　of　energy　transport,　energy　spectrum　and　angular　distribution　of　loss　electron　are　simulated　by　PIC　code,　energy　spectrum　of　bremsstrahlung　photons　as　well　calculated　though　Monte　Carlo　method.　Computational　results　show　that　the　velocity　of　loss　electron　is　less　than　2.998×108　m/s,　the　angular　excursion　of　electron　is　not　much　in　a　board　extent　of　energy　spectrum.　These　results　show　an　indirect　diagnosis　of　vacuum　insulted　transmission　line　working　status　based　on　loss　electron　bremsstrahlung.