Abstract: The application of series hybrid buses at home and abroad, its mechanism, operating mode and advantages are introduced. It aims to sort out one technique scheme suitable for Chinese public transport system development, through analyzing features of the application of series hybrid system to buses under public transport working condition. Both simulation calculation and the actual operating statistics are adopted for the analysis and comparison of efficiency, braking energy feedback, idling and others. The result proves that series hybrid buses are fuel-saving and eco-friendly. Series hybrid technique is one of the solutions for hybrid electric vehicles. Series hybrid system is applicable for city buses.

Key words: Environmental protection, Power system, Serial hybrid