Measurement　of　material　elastic　constants　for　limited-size　samples　by　ultrasonic　method　is　described　and　validated.　Based　on　acoustic　microscope　technology,　the　material　elastic　constants　are　determined　by　longitudinal　wave　and　leak　surface　wave　velocities　simultaneously　measured　by　developed　ultrasonic　system　with　a　line-focus　PVDF　transducer.　In　this　paper,　the　elastic　constants　of　limited-size　Cr(2)O(3)　doping　on　0.2　PZN-0.8　PZT　piezoelectric　ceramic　wafer　sample　are　determined　and　the　measurement　errors　are　analyzed.　The　experimental　results　show　this　ultrasonic　system　can　be　used　for　measurement　of　material　elastic　constants　for　limited-size　samples　with　high　measurement　precision,　and　the　relative　errors　for　Poisson＇s　ratio　and　Young＇s　module　measurements　are,　respectively,　less　than　1%　and　3%.　It　can　satisfy　the　requirement　of　engineering　and　science　research.　Furthermore,　it　is　suitable　to　measure　elastic　constants　of　both　isotropic　and　anisotropic　materials　by　ultrasonic　method　with　help　of　developed　ultrasonic　system.　(C)　2009　Elsevier　Ltd.　All　rights　reserved.