  We show a possible way to build the AdS/CFT correspondence starting from the
quantum field theory side based on renormalization group approach. An extra
dimension is naturally introduced in our scheme as the renomalization scale.
The holographic wave equations are derived, with the potential term being
determined by the QFT properties. We discover that only around the fixed point,
i.e. the conformal limit, the potential in the bulk equations can be fully
constrained, and upon this foundation, the correspondence is build. We
demonstrate this fact using a 3D scalar theory in which, besides the trivial
fixed point, there exists the Wilson-Fisher fixed point. From the energy
scalings around those fixed points, we determine the behavior of the potential
in the bulk equations.
