This　paper　considers　the　features　extraction　of　Gas　Insulated　metal-enclosed　switchgear(GIS)　which　suffer　from　partial　discharge　(PD)　by　floating　electrode　defect.　The　220kV　GIS　bus　bar　cavity　is　taken　as　an　object　to　design　physical　model　of　floating　electrode　defect.　The　experiment　PD　data　are　obtained　from　a　220　kV　GIS　equipment　using　Ultra-high　frequency(UHF)　partial　discharge　measurement.　The　data　is　stored　as　phase　resolved　pulse　sequence　(PRPS)　data　format.　This　data　format　allows　the　actual　test　voltage　(rms)　of　every　cycle,　the　number　of　measuring　cycles,　phase　information　of　all　PD　pulses,　together　with　their　peak　values　to　be　obtained,　so　the　discussion　of　statistical　analysis　of　the　floating　electrode　defect　can　be　performed.　Firstly,　the　phase　resolved　partial　discharge　(PRPD)　pattern　is　calculated　from　the　PRPS　data　sets.　Then,　the　statistical　operators　at　different　voltage　levels　are　extracted　from　the　PRPD　patterns　of　the　floating　electrode　defect.　On　the　basis　of　the　present　experimental　research　and　statistical　analysis,　statistical　operators　such　as　skewness,　kurtosis　can　be　used　to　classify　different　PD　defects.