This　paper　introduces　network　structure　of　series　hybrid　electric　vehicle　and　the　principle　how　it　works.　According　to　CANopen　protocol　and　functions　of　powertrain　controller,　a　preliminary　version　of　CANopen　profile　for　the　powertrain　controller　is　drafted　out.　And　then　a　CANopen　slave　stack,　based　on　the　PowerPC　and　eCos,　is　designed　and　implemented　for　the　powertrain　controller　of　the　BJUT-SHEV　(Series　Hybrid　Electric　Vehicle　of　Beijing　University　of　Technology).　©　2010　IEEE.