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We report the generation of heralded single photons with Gaussian-shape temporal waveforms through the spatial light modulation technique in an atomic ensemble.Both the full width at half maximum and the peak position of the Gaussian waveform can be controlled while the single photon nature holds well.We also analyze the bandwidth of the generated single photons in frequency domain and show how the sidebands of the frequency spectrum are modified by the shape of the temporal waveform.The generated single photons are especially suited for the realization of high efficiency quantum storage based on electromagnetically induced transparency.