A　control　strategy　based　on　fuzzy　logic　is　proposed　for　a　series　hybrid　electric　vehicle.　According　to　the　stat-of-charge　of　batteries　and　the　power　required　by　the　vehicle,　the　engine　output　power　is　real-time　changed　to　realize　constant　SOC　control,　and　the　fuel　consumption　and　emissions　are　considered　as　well.　The　architecture　of　the　vehicle　controller　is　given　and　a　forward　simulation　model　for　the　vehicle　is　established.　Both　off-line　and　hardware-in-loop　simulations　are　performed.　Simulation　results　show　that　the　fuzzy　logic　control　strategy　can　maintain　the　SOC　of　batteries　nearby　the　exceptive　value　0.7,　and　the　engine　works　at　its　high　efficiency　area　to　get　low　fuel　consumption　and　emissions.