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An optical lattice could be produced either by splitting an input light (splitting scheme) or by reflecting the input light by a mirror (retro-reflected scheme).We study quantum dynamical properties of an atomic Bose-Einstein condensate (BEC) in the two schemes.Adopting a mean field theory and neglecting collision interactions between atoms,we find that the momentum and spatial distributions of BEC are always symmetric in the splitting scheme which,however,are asymmetric in the retro-reflected scheme.The reason for this difference is due to the local field effect.Furthermore,we propose an effective method to avoid asymmetric diffraction.