EMI　(Electromagnetic　Interference)　noise　prediction　technique　need　accurate　model　of　each　components　on　PCB　board,　the　model　of　PCB　trace　plays　an　important　role,　previous　work　may　not　pay　enough　attention　on　it.　This　work　proposed　a　circuit　model　which　describe　the　PCB　trace　parasitic　characteristic　in　a　wide　band　frequency　with　considerable　accuracy　base　on　Q3D　simulation　result,　moreover,　a　new　the　circuit　parameters　extract　method　is　proposed　at　the　same　time.　©　2019　IEEE.