An　ultrasonic　system　to　measure　material　elastic　constants　of　small　sample　was　developed.　It　aims　at　the　especial　needs　in　testing　mechanical　properties　of　bulk　nano-material.　The　system　includes　a　line-focus　PVDF　transducer,　a　four-axis　precise　moving　framework,　an　NI　PXI　bus　embedded　controller,　an　ultrasonic　pulse　generator/receiver　and　a　digital　oscilloscope.　Based　on　acoustic　microscope　technology,　material　elastic　constants　are　determined　by　measuring　longitudinal　wave　and　leak　surface　wave　velocity　simultaneously.　This　method　is　suitable　not　only　to　measure　the　elastic　constants　of　isotropic　material,　but　also　those　of　anisotropic　one.　Experimental　results　show　that　the　system　functions　nicely.