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The anomalous ultrasonic attenuation of longitudinal wave propagated in KDP and DKDP have been discussed and calculated near Curie-temperature (Tc) in Paraelectric phase in the frequency range 5 to 50 MHz. The attenuation of longitudinal waves is primarily due to a strong interaction with thermally excited phonon in the coupled-soft mode. Temperature and frequency variations of attenuation are discussed. Anharmonicity in the crystal potential is essential to discuss (observe) critical attenuation.

Investigation of Deuteration Effect on Sound Attenuation in Hydrogen Bonded Ferroelectric Crystals