With　the　development　of　technology　such　as　the　internet,　GPS,　and　mobile　payment,　parking　problems　can　now　be　addressed　by　parking　reservations.　Taking　the　public　parking　lot　as　the　research　object,　different　parking　space　allocation　mechanisms　are　compared　and　discussed,　such　as　first　come　first　served　(FCFS)　and　first　book　first　served　(FBFS).　This　paper　proposed　a　model　maximizing　social　welfare.　Three　indicators,　including　utilization　of　the　parking　spaces,　revenue,　and　acceptance　rate,　are　selected　to　evaluate　the　effect　of　different　supply　and　demand　scales　on　efficiency.　Numerical　experiments　are　conducted,　and　a　tabu　research　algorithm　is　used.　The　results　show　that　the　parking　space　utilization　rate　and　profit　can　be　increased　by　7.1%　and　24.1%,　respectively,　compared　with　FCFS　and　FBFS.　The　research　can　provide　a　theoretical　foundation　for　the　improvement　of　parking　space　utilization　rate　in　parking　reservation　mode.