Abstract: The behavior of ultrasonic wave propagating along plate structures using edge-mounted transducer by dynamic photo-elastic method was presented. The conversion conditions and reasons of series of longitudinal waves and the generation of Lamb wave were also presented. The wave front energy attenuation and the energy transportation between each wave series while the wave being propagating along the plate were revealed also. Through photo-elastic experiment and the comparison test, the employment of higher frequency(2 MHz) longitudinal edge-mounted transducer was verified to be a viable option for large plate structure defect inspection.