  In this paper, we show that the bulk reconstruction in the AdS/CFT
correspondence is rather simple and has an intuitive picture, by showing that
the HKLL bulk reconstruction formula can be simplified. We also reconstruct the
wave packets in the bulk theory from the CFT primary operators. With these wave
packets, we discuss the causality and duality constraints and find our picture
is only the consistent one. Our picture of the bulk reconstruction can be
applied to the asymptotic AdS spacetime.
