Based　on　the　acoustic　microscopy　nondestructive　testing　system,　the　surface　acoustic　wave　velocities　of　two　types　of　special　samples　that　were　processed　by　additive　manufacturing　(3D　printing)　and　powder　metallurgy　were　measured　by　using　line-focusing　PVDF　transducers,　which　can　be　used　for　the　inversion　of　mechanical　properties　of　materials.　The　surface　wave　velocities　at　different　positions　and　angles　were　obtained　by　defocus　measurement　and　time-resolved　method.　Mechanical　properties　at　the　corresponding　position　and　angle　were　calculated　by　these　surface　wave　velocities.　To　improve　the　resolution　of　the　transducer,　the　line-focusing　PVDF　transducer　with　1　mm　wide　film　was　developed　specially　to　reduce　the　detection　area.　Measurement　results　show　that　the　surface　wave　velocities　in　the　arbitrary　directions　are　constant　for　powder　metallurgical　material,　namely　isotropy.　Surface　wave　velocities　of　3D　printing　material　at　different　directions　are　slightly　different,　showing　anisotropy.　The　acoustic　performance　of　arbitrary　angle　or　small　area　of　materials　can　be　measured　by　the　acoustic　microscopic　nondestructive　measurement　system,　which　is　used　to　inverse　the　material　mechanical　properties　with　high　precision　and　reliability.　It　provides　a　nondestructive　testing　and　evaluation　method　for　performance　test　of　new　materials　and　the　assessment　of　new　processing.　©　2017,　Editorial　Department　of　Journal　of　Beijing　University　of　Technology.　All　right　reserved.