  We explore the possible microscopic structure of a charged AdS black hole
from the quantized viewpoint. A further study shows that some black holes
cannot absorb "energy quantum" under certain conditions from the view of
quantization. By the quantization of the black hole horizon area, we show the
relation between the number of quanta of area and the microscopic degrees of
freedom of the black hole. We also interpret a latent heat of thermodynamical
phase transition as a transition between the number of quanta of area of large
black hole(LBH) and the number of quanta of area of small black hole(SBH) in
the charged AdS black hole. Furthermore, the Ruppeiner scalar curvature
connecting with the number of quanta of area is also shown.
