Abstract: Viewing angle and it's passageway or viewing channel play an important roll in holography, but researches have not pay enough attention to these concepts for long time.First,this paper gives the definition of viewing angle and viewing passageway for holography,and points out that the various holograms can be taken for different viewing angle passageway,such as double passageway,left right passageway,color passageway,synthetic hologram et al.In addition,using of the concept of viewing angle passageway, a lot of holographic original phenomena can be explained.