Compared　to　spherical　particles,　which　are　the　most　prevalent　subjects　studied　by　other　researchers,　free　wire-type　metallic　particles　have　unique　motion　phenomena　in　electric　fields　under　DC　voltage,　playing　an　important　role　in　insulation　flaw　detection　of　power　equipment.　However,　this　is　rarely　researched　sufficiently.　Thus,　the　enclosed　experimental　chamber　and　the　observation　systems　are　specially　designed　and　motion　characteristics　of　the　wire-type　particles,　with　diameters　0.25　mm,　0.4　mm,　0.65　mm　and　lengths　1　mm,　2　mm,　3　mm,　4　mm,　are　studied.　The　results　show　that　probabilities　of　Firefly　and　Standing　Phenomena　increase　with　lengths　of　wire-type　particles　increasing,　and　the　phenomena　are　more　likely　to　appear　on　the　negative　electrode.　When　the　pressure　decreases　and　radiuses　of　particles　fall,　probabilities　of　Firefly　and　Standing　Phenomena　increase.　In　the　case　of　1mm　diameter,　there　are　not　any　special　phenomena　under　various　conditions　and　the　motion　of　particles　is　disorder.　Lastly,　the　explanation　of　experimental　phenomena　is　done　in　the　view　of　space　charge.