Heat efficiency is improved by making a lean burn in a spark ignition engine, but on the other hand, it brings on problems that ignition probability falls into misfire and/or decreases effective work due to the downslide of flame propagation. It is important to make lean burn succeed in strong turbulence field to avert these problems. In the present study, the ignition and combustion characteristics of the spark plug with dome-shaped flanges that has some holes for exchanging gas were examined by using swirling flow fields. The result shows that the dome flanged spark plugs were high ignition probability compared with conventional plug. It is considered the reason was the effect of the collection of the shock wave energy and the effect of suppressing the flow in vicinity of the spark gap. Especially, in lean mixture condition, the ignition probability of the dome flanged spark plug with three holes was the highest. The combustion characteristics of dome flanged spark plug that has 2.4mm holes was better than conventional and other dome flanged spark plugs. Furthermore, when the direction of the hole was set up in the direction where a flow is introduced, combustion characteristic was improved.