In　order　to　study　the　environmental　problem　under　high　voltage　transmission　lines,　electromagnetic　field　around　110　kV　high　voltage　transmission　lines　were　theoretically　calculated　and　measured.　Using　method　of　simulation　electric　charge,　we　calculated　electric　field　strength,　and　also　computed　magnetic　field　strength.　It　drew　a　conclusion　that　electric　field　was　depended　on　vertical　field　strength,　but　magnetic　field　was　depended　on　vertical　field　strength　and　horizontal　field　strength.　Compared　to　HJ/T24-1998　where　the　recommendation　standard　of　electric　field　is　4　kV/m　and　limited　value　of　magnetic　field　strength　is　0.1　mT,　value　of　calculating　and　measure　are　lower　national　standard.　Result　will　help　paper　reduce　people＇s　dread　mind,　who　live　near　the　high　voltage　transmission　lines,　and　has　realizable　meaning.