Ultrasonic waves are sound waves, which have frequency more than audible limit. The value of ultrasonic velocity (?) with composition (c) in a binary mixture of Methanol + Aniline and 1-Propanol + Aniline shows that ultrasonic velocity (?) increases progressively as composition of Methanol increases in the mixture. Adiabatic compressibility (?a) of Methanol + Aniline show decrease wave like with increases of Methanol in the mixture and this nature is exactly in reciprocate nature of velocity composition curve. This curve is wave like changing in nature showing a molecular interaction between the Methanol and Aniline mixture is weak interaction. This interaction between the molecules may be due to the functional groups of Methanol and Aniline binary mixture.