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Lean burn technology has a problem of greater combustion fluctuation due to unstable initial flame formation and slow combustion. It is generally known that generating a flow field in the cylinder is effective for reducing combustion fluctuation and shortening the combustion period. In this study, we investigated the influence of the discharge condition and in-cylinder swirl flow on initial flame formation and ignition performance between conventional spark ignition (SI) and multistage pulse discharge (MSPD) ignition. Visualized photographs were obtained near the spark plug with a high-speed camera in an optically accessible engine. In-cylinder pressure analysis was also performed in order to explicate the combustion phenomena. The results revealed that ignition performance of both SI and MSPD was improved under a swirl flow condition in the cylinder and that combustion fluctuation was effectively reduced.