Light pulse can be greatly slowed down and even completely stopped based on the phenomenon of electromagnetically induced transparency (EIT). In this paper, we study the storage and manipulation of photonic information with slow light effect. The content includes the studies of photon switching, storage and manipulation of light, and light-storage cross-phase modulation (XPM). Our studies show that the photon switching system and light-storage technique may have important applications in quantum communications and computations.