In　order　to　solve　the　problem　of　carrying　H2　on　vehicle,　this　paper　proposes　a　new　method　to　produce　H2　on　board　by　using　energy　of　engine　exhaust　heat　to　support　methanol　steam　reforming.　The　engine　thermal　efficiency　can　be　largely　improved　and　engine　pollutants,　thermal　and　noise　emissions　can　be　further　reduced　by　the　mixed　combustion　of　fuel　and　the　hydrogen-rich　reformed　gas　inducted　into　the　cylinders　produced　by　this　method.　In　this　paper　an　apparatus　was　designed　to　produce　hydrogen-rich　gas　by　methanol　steam　catalytic　reforming　using　engine　exhaust　heat.　The　reformed　reactor　was　based　on　a　porous　ceramic　substrate　using　Cu/Zn/Al/Zr　as　reforming　catalysts　and　a　tube-type　heat　exchanger　to　heat　the　ceramic　reactor　to　accomplish　the　reforming　reaction　of　methanol/water　solution　in　the　ceramic　pores.　The　engine　test　showed　that　hydrogen　volume　fraction　in　the　reformed　gas　increased　with　the　engine　exhaust　temperature　and　reached　a　maximum　of　41.9%　at　the　exhaust　temperature　of　350C.