The temporal-spatial evolution behaviors of the dimensionless energy flux density is calculated by means of transfer matrix method and Fourier transform when the optical pulse passes through one-dimensional photonic crystals. It will help us to know the details of energy transportation at any position and any time. The energy transportation behavior is a result of the coherent superposition of all Fourier components which experience different phase shifts and different amplifications in the medium. The electric field of a Gaussian pulse at the output port is also discussed as a function of time.