Ultrasonic　power　transfer　(UPT)　has　become　an　important　way　of　energy　transmission　in　industrial　and　medical　fields　because　of　its　advantages　of　high　transmission　power,　zero-electromagnetic　shielding,　and　harmlessness.　In　this　article,　a　semianalytical　UPT　modeling　method　is　proposed　based　on　the　finite　element　model　of　metal　wall　and　the　analytical　model　of　piezoelectric　material　through　a　two-port　network　transfer　matrix.　The　proposed　model　can　achieve　the　accurate　simulation　of　complex　UPT　systems　and　efficiently　optimize　parameters.　The　calculation　results　of　the　model　are　compared　with　the　measured　results　in　the　metal　wall　UPT　and　the　accuracy　of　the　model　method　is　proved.　In　addition,　the　UPT　with　asymmetric　excitation　and　receiving　ends　was　explored　with　this　model　for　the　first　time.　The　effects　of　piezoelectric　transducer　radius,　piezoelectric　transducer　thickness,　and　metal　wall　thickness　on　the　system　performance　of　UPT　were　comprehensively　analyzed　and　the　influences　of　various　parameters　on　the　system　performance　of　UPTs　were　investigated.