The　rotor　of　the　locomotive　turbocharger　is　prone　to　malfunction　of　the　turbocharger,　and　it　is　also　the　most　important　part　of　the　turbocharger.　The　reasonable　establishment　of　rotor　dynamics　model　is　very　important　in　the　study.　It　determines　the　accuracy　of　analysis.　The　influence　of　the　shaft　quality　on　the　turbine　and　impeller　was　not　considered　in　the　process　of　analyzing　the　dynamic　model　in　the　passed　research.　But　the　quality　of　locomotive　turbocharger　rotor　shaft　is　relatively　large,　it　cannot　be　ignored　because　it　will　have　a　large　bending　moment　in　the　model　simplified.　So　the　rotor　dynamic　equation　was　deduced　in　the　case　of　considered　the　quality　of　the　rotor　axis.　The　rotor　of　the　turbocharger　rotor　was　simplified　firstly,　the　various　parts　of　the　simplified　rotor　were　analyzed,　and　the　dynamic　model　of　the　rotor　was　established.　And　the　dynamic　model　was　verified　by　the　hammer　experiment.　The　factors　considered　in　the　dynamic　model　were　more　comprehensive,　so　the　model　would　be　more　practical　for　the　future　research.