This　paper　studied　the　idling　characteristic　of　a　hydrogen-blended　methanol　engine　under　lean　conditions　and　three　hydrogen　volume　fractions　in　the　intake　of　0,　1%　and　2%.　The　test　was　accomplished　on　a　spark-ignition　equipped　with　a　hydrogen　port-injection　system.　The　test　results　showed　that　the　addition　of　hydrogen　contributed　to　the　reduced　fuel　energy　consumption　at　the　idle　condition.　Because　of　the　reduced　engine　idle　speed,　the　engine　fuel　energy　consumption　rate　was　further　reduced　after　increasing　the　excess　air　ratio　of　hydrogen-methanol-air　mixtures.　Both　flame　development　and　propagation　periods　were　shortened　and　F1C　and　CO　emissions　were　reduced　after　the　addition　of　hydrogen　for　the　methanol　engine　at　the　idle　and　lean　conditions.