  In this work we use the quasinormal mode of a massless scalar perturbation to
probe the phase transition of the charged-AdS black hole in time profile. The
signature of the critical behavior of this black hole solution is detected in
the isobaric process. This paper is a natural extension of [1, 2] to the time
domain analysis. More precisely, our study shows a clear signal in term of the
damping rate and the oscillation frequencies of the scalar field perturbation.
We conclude that the quasinormal modes can be an efficient tool to detect the
signature of thermodynamic phase transition in the isobaric process far from
the critical temperature, but fail to disclose this signature at the critical
temperature
