According　to　the　unstable　phenomenon　of　bus　arrival　time,　a　real-time　bus　speed　control　strategy　is　proposed　in　this　paper,　aiming　at　minimizing　the　mean　absolute　error　of　bus　headway.　Three　kinds　of　bus　operation　scenes　are　designed,　and　the　expected　speed　is　calculated　based　on　the　real　time　traffic　state　and　the　passenger　arrival　rate.　Through　numerical　simulation,　the　stability　of　the　bus　headway,　the　reliability　of　the　bus　running　time,　the　average　waiting　time　of　the　passengers　and　the　speed　of　the　operation　are　evaluated.　The　results　show　that　the　strategy　can　improve　bus　headway　stability　about　77.63%　and　bus　operation　reliability　about　93.5%,　which　is　the　best　in　the　three　scenarios.　However,　the　average　waiting　time　for　passengers　will　increase　about　6.12%　when　the　impact　of　road　traffic　flow　is　considered.　Therefore,　the　strategy　is　more　effective　for　improving　stability　of　the　route　which　is　less　affected　by　the　traffic　flow　or　shorter　in　length.　To　achieve　the　goal　of　improving　stability,　the　target　bus　is　not　necessary　to　travel　as　fast　as　possible.　Copyright　©　2018　by　Science　Press.