Abstract: Ultrasonic velocity as a function of temperature and concentration has been measured using an automatic pulse-echo velocimcter in the aqueous solution of hydrogen peroxide. The relative error on the present sound velocity measurements is about one part in 2×10⁴. The various acoustic parameters, namely, the molar sound velocity, adiabatic compressibility, specific acoushc impedance for the solution and the sound velocity of pure hydrogen Peroxide have been computed. We believe these acoustic parameters are reported for the first time. The variation of these constants with concentration has been discussed. Ultrasonic velocity and other constants except adiabatic compressibility are found to increase with concentration.