To　improve　the　efficiency　of　V2V,　Efficient　Clustering　V2V　Routing　Based　on　PSO　(Particle　Swarm　Optimization)　in　VANETs　(CRBP)　is　proposed　in　this　paper.　First,　vehicle　nodes　with　identical　moving　directions　are　defined　and　the　cluster　heads　are　selected.　Second,　for　the　required　routing　optimization,　the　route　particle　and　its　velocity　coding　rules,　iteration　rules,　and　fitness　function　are　designed.　Thirdly,　the　methods　that　can　signally　improve　the　routing　efficiency　in　the　cluster　and　among　clusters　are　proposed.　Finally,　SUMO　and　NS3　are　used　to　simulate　and　analyze　the　performance　of　the　CRBP.　The　simulation　results　indicate　that　the　node　numbers,　node　communication　radius,　and　maximum　hops　between　the　cluster　head　and　any　normal　node　in　its　cluster　have　a　major　influence　on　the　performance　of　CRBP;　relative　to　CBVRP　and　QoS-OLSR,　CRBP　has　a　20%　increase　in　packet　delivery　ratio　(PDR)　and　a　47%　decrease　in　delay　at　best.　(C)　2019　Elsevier　Ltd.　All　rights　reserved.