Experiments　are　proposed　to　study　the　sound　field　characteristics　of　linear　ultrasonic　phased　array　with　different　sound　beam　steering　angles　and　sound　field　radius,　and　compared　to　the　results　from　the　calculation　method　of　phased　array　sound　field　based　on　transient　wave　displacement　analytical　solutions.　Firstly,　the　calculation　method　based　on　the　transient　off-plane　displacement　of　semicircle　arc　is　researched,　and　the　accuracy　of　numerical　calculation　is　optimized.　Secondly,　an　ultrasonic　phased　array　direcvity　measurement　system　are　established,　semi-circular　steel　plates　are　used　as　the　measuring　specimens,　and　the　longitudinal　wave　transducer　is　used　as　the　measuring　transducer.　The　beam　directivity　of　linear　phased　arrayis　measured　at　different　steering　angles　(-10°,　-30°,　-50°　and　-70°)　and　sound　field　radius　(50　mm,　75　mm,　100　mm　and　125　mm).　Then,　the　beam　directivity　of　linear　phased　array　is　calculated　numerically　based　on　the　transient　wave　displacement　method　with　the　same　sets.　Finally,　the　experimental　results　are　compared　with　the　theoretical　results　and　agrees　well　with　each　other.　It　demonstrates　the　calculation　method　of　phased　array　sound　field　based　on　transient　wave　displacement　analytical　solutions　is　accurate,　as　well　as　for　sound　beam　steering　large　angles　and　sound　field　radius　changing.　©　2020　Acta　Acustica.