Abstract: Using the method of van Hove in the theory of approach to equilibrium, we analyse Kubo's formula of transport coefficients. The results of dynamical theory are obtained without using the assumption of random phase and compared with the solution of Boltzmann equation. We expect that the phase interference effect may be observed in the high-frequency phenomena of strongly interacting system. The macroscopic measurement of high-frequency linear transport process does not destroy this interference effect.