Caching　is　the　key　technology　that　can　improve　the　performance　of　the　parallel　file　system.　The　implementation　of　client＇s　directory　caching　not　only　reduces　the　directory　server＇s　burden,　but　also　simplifies　the　operation　process　and　improves　the　performance　of　parallel　file　system.　This　paper　proposes　a　client＇s　directory　caching　model　by　analyzing　PVFS　structure.　Then,　it　does　some　research　in　the　key　issues　on　client＇s　directory　caching,　such　as　the　location　of　caching,　consistency　and　so　on.　By　analysing,　it　presents　the　solutions　concretely　and　further　more,　implements　a　prototype　system　of　client＇s　directory　caching.　The　testing　results　demonstrate　that　using　directory　caching　can　improve　the　performance　of　PVFS.