Based　on　the　theory　of　shared　parking,　a　shared　parking　decision　in　residential　areas　is　designed　as　a　pricing　and　parking　space　allocation　jointed　model.　Because　the　available　time　gap　of　parking　spaces　in　residential　areas　have　the　characteristics　of　fragmentation,　the　sharing　mechanism　of　parking　spaces　in　residential　area　is　considered.　The　allocation　strategies　such　as　first-come-first-served　(FCFS)　and　optimal　allocation　(OA)　are　compared.　For　improving　the　utilization　and　economic　efficiency　of　parking　facilities,　the　optimal　allocation　model　of　parking　space　is　established　and　the　solution　algorithm　is　designed.　Net　benefit　and　parking　duration　utilization　are　proposed　as　evaluation　indexes　and　simulation　experiment　is　carried　out.　The　results　show　that　utilization　rate　of　parking　time　can　increase　by　12.27%,　and　the　profit　rate　can　increase　by　18.08%,　which　indicates　that　after　setting　the　shared　parking,　over-saturated　parking　in　residential　areas　reduces　significantly,　and　parking　space　utilization　efficiency　improves.　©　ASCE.