For　that　automotive　engine　fueled　with　natural　gas　required　more　spark　energy　in　starting　process,　a　new　type　of　ignition　system　was　developed　to　solve　the　questions　that　engine　was　hard　to　start　and　was　misfired　in　heavy　load.　ATmaga8　single-chip　microcontroller　was　adopted　as　the　core　of　the　ignition　control　system　and　C　language　was　used　to　develop　engine　program.　Based　on　the　cylinder　detection　signal　input　and　the　ignition　signal　from　ECU,　with　the　PWM　wave　of　counter　2,　ignition　control　signal　was　output.　The　primary　circuit　of　ignition　coil　was　controlled　by　the　driving　circuit　in　order　to　control　the　spark　timing.　The　spark　energy　was　enhanced　effectively　before　TDC　due　to　the　about　100　times　ignitions.　The　experimental　results　show　that　the　spark　energy　of　the　new　type　ignition　system　is　much　larger　than　the　conventional　one.　©　2011　IEEE.