In　this　paper,　an　automatic　measurement　system　of　leaky　Lamb　waves　dispersion　curves　based　on　Lab　VIEW　is　developed.　In　this　system,　the　PVDF　line-focus　transducer　is　controlled　to　defocus　through　the　movement　of　the　linear　stage,　and　the　NI　PXI-5154　digitizer　is　controlled　to　acquire　echo　signals,　then　the　calculation　program　is　called　to　process　the　echo　signals　for　calculating　phase　velocities　of　measured　leaky　Lamb　wave　modes.　Two　stainless　steel　samples　of　5　mm　and　0.5　mm　in　thickness　are　experimentally　tested　by　using　this　developed　system.　Up　to　five　modes　of　leaky　Lamb　waves　can　be　identified.　The　results　are　consistent　with　the　theoretical　values.　The　dispersion　curves　of　leaky　Lamb　waves　can　be　traced　automatically　through　this　system.　©　2012　IEEE.