From the wave equation description the wave motion of substantial particles in microcosmic system, it scan ana lysis that wave function has two forms: real function and complex function.

Using the harmonic oscillator model of quasicrystal of liquid, the wave equation describing the motion of liquid molecules has been derived.

Introducing the complex viscoelastic modulus, visco-elastic wave equation has the similar form with elastic wave equation for harmonic wave motion, in case of linear viscoelastic.