This　study　carried　out　the　steam　reforming　of　PRF93　(93%　iso-octane　and　7%　n-heptane　by　vol.)　to　produce　hydrogen　by　simulating　the　internal　combustion　engine　exhaust　heat.　An　apparatus　was　designed　to　conduct　catalytic　reforming　experiments,　and　multiple　parameters　were　adjusted　to　improve　the　hydrogen　yield,　while　optimizing　the　test　with　orthogonal　design.　The　test　results　show　that　when　the　catalytic　reforming　temperature　is　650°C,　the　gas　hourly　space　velocity　(GHSV)　is　196　h-1,　and　the　ratio　of　deionized　water　over　PRF93　by　vol.　is　0.30:0.12,　therefore,　the　largest　hydrogen　volume　fraction　in　the　reformed　gas　is　obtained,　which　is　54.23%　and　the　relevant　CO　volume　fraction　is　19.44%.