With　the　development　of　information　technology　and　the　progress　of　informationization,　the　global　data　grows　explosively.　Confronting　PB　level　storage　requirements,　traditional　file　systems　have　bottleneck　on　capacity　and　performance　expansion.　Cloud　storage　is　widely　acknowledged　by　IT　industry　because　of　its　advantages,　such　as　expandability,　cost-effective,　high　fault-tolerance.　As　the　basis　of　cloud　storage,　distributed　file　system　achieves　promotion　of　system　availability　and　fault-tolerance　by　introducing　data　replication　technology.　However　replica　brings　about　a　lot　of　problems　such　as　bandwidth　and　storage　consumption,　unexpected　data　inconsistency,　load　balance　and　so　on.　Firstly,　a　distributed　file　system　model　MSFS　is　established　as　the　basis　of　the　follow-up　research.　Then,　according　to　replica　dynamic　period,　a　replica　dynamic　creation　strategy　FLDC　(replica　dynamic　creation　strategy　based　on　user　access　frequency　and　lightest　load)　is　proposed　based　on　users＇　access　frequency　and　node　loads.　The　strategy　obtains　the　hot　file　whose　accessed　number　above　a　specific　threshold　and　then　dynamic　create　the　copy　on　the　lightest　load　node　in　the　same　zone.　Comparing　with　the　static　replication　strategy,　the　experiment　results　show　that　FLDC　strategy　has　a　better　performance　in　load　balance　and　access　rate.　©　2012　IEEE.