The　spark　energy　measurement　system　was　successfully　developed　for　accelerating　the　development　process　of　the　electronic-controlled　unit　and　optimizing　the　combustion　process　of　the　engine.　The　control　and　monitor　interface　communicated　with　the　MCU　of　ignition　module　through　serial　communication　port,　the　operation　parameters　could　be　monitored　in　real　time.　The　speed　signal　was　input　to　the　MCU,　and　it　was　adopted　as　baseline　for　calculating　the　ignition　advance　angle　and　ignition　timing.　The　transistor　was　driven　by　ignition　control　signal　which　was　output　by　MCU　to　control　the　power　on-off　of　the　primary　circuit.　Reference　to　SAE　J973-1999　standard,　a　Zener　string　was　introduced　as　simulation　load.　The　output　voltage　of　secondary　coil　and　current　of　secondary　circuit　were　acquired,　and　the　output　energy　of　secondary　coil　could　be　calculated　by　the　integral　of　the　product　of　spark　voltage　and　spark　current　that　are　varying　with　time.　The　output　energy　of　secondary　coil　was　adopted　as　a　standard　to　evaluate　the　spark　energy.　Test　results　show　that,　for　the　ignition　module　developed　for　JL465Q5,　the　spark　energy　can　be　evaluated　effectively　and　quantitatively.