Rayleigh wave modes depend on porosity of Ti–6Al–4V alloy with porosities between 60–75%. It is very important in many applications and understanding of bonding arrangements at propagating surface acoustic-wave velocities. These velocities are deduced from the analysis of the topped acoustic signatures’ curves obtained by recording the output signal $V$. We used simulation of acoustic microscopy to measure Rayleigh velocities. The acoustic parameters were determined as follow: longitudinal ($V_L$), transverse ($V_T$), and Rayleigh ($V_R$) velocities from 1139 ms$^{-1}$ to 285 ms$^{-1}$, from 87 ms$^{-1}$ to 143 ms$^{-1}$, and from 562 ms$^{-1}$ to 136 ms$^{-1}$, respectively, for porosity from 60% to 75%.