It　was　described　and　validated　the　ultrasonic　system　with　a　line-focused　PVDF　transducer　for　the　measurement　of　the　elastic　constants　of　small-size　samples.　The　objective　of　this　system　was　to　measure　the　elastic　constants　of　limited-size　samples　with　high　accuracy　on　the　base　of　acoustic　microscope　technology.　The　elastic　constants　of　aluminum,　copper,　steel,　and　titanium-alloy　were　determined　by　measuring　the　velocity　of　the　longitudinal　and　leak　surface　waves　simultaneously.　Results　were　similar　to　these　obtained　by　the　general　test　method　and　the　theoretic　simulations.　This　showed　that　the　ultrasonic　test　method　is　feasible　and　the　results　were　reliable.　The　error　analysis　showed　that　the　measuring　system　had　a　higher　accuracy　and　the　errors　of　Poisson＇s　ratio　and　Young＇s　modulus　was　within　3%.　This　can　meet　the　need　of　the　engineering　and　scientific　research.　Moreover,　the　method　can　be　used　to　determine　elastic　constants　of　both　isotropic　and　anisotropic　materials.