In this paper, we discussed the design of the ultrasonic WPT system, consisting of impedance-matched transducers, phononic-crystal structure, and the Schlieren optical measurement system. The transducers we designed show 60% energy-transmission efficiency at 1.2MHz. The phononic structure is designed via phonon-band analysis and fabricated by using 3D printer for controlling ultrasonic wave. The Schlieren optical measurement system is also designed for analyzing actual wave propagation in water at MHz regime without disturbing the wave propagation.