Anonymous　Communication　(AC)　hides　traffic　patterns　and　protects　message　metadata　from　being　leaked　during　message　transmission.　Many　practical　AC　systems　have　been　proposed　aiming　to　reduce　communication　latency　and　support　a　large　number　of　users.　However,　how　to　design　AC　systems　which　possess　strong　security　property　and　at　the　same　time　achieve　optimal　performance　(i.e.,　the　lowest　latency　or　highest　horizontal　scalability)　has　been　a　challenging　problem.　In　this　paper,　we　propose　an　ObliComm　framework,　which　consists　of　six　modular　AC　subroutines.　We　also　present　a　strong　security　definition　for　AC,　named　oblivious　communication,　encompassing　confidentiality,　unobservability,　and　a　new　requirement　sending-and-receiving　operation　hiding.　The　AC　subroutines　in　ObliComm　allow　for　modular　construction　of　oblivious　communication　systems　in　different　network　topologies.　All　constructed　systems　satisfy　oblivious　communication　definition　and　can　be　provably　secure　in　the　universal　composability　(UC)　framework.　Additionally,　we　model　the　relationship　between　the　network　topology　and　communication　measurements　by　queuing　theory,　which　enables　the　system＇s　efficiency　can　be　optimized　and　estimated　by　quantitative　analysis　and　calculation.　Through　theoretical　analyses　and　empirical　experiments,　we　demonstrate　the　efficiency　of　our　scheme　and　soundness　of　the　queuing　model.