Residential space has developed greatly in 20 century,especially on the bright and open space require-ments,has become the epitome of the Modernism and the Spirit of the age.Excessive adapt to the glass curtain wall to achieve bright space seems to have become one of the architecture and law of the house today, but very few people to pay attention to research in the residential light,specially the problem of natural light. The effective use of natural light is playing a huge positive role and affecting our design field.The natural light researching has become an indispensable important goal of design, and it has deeply influenced the architecture and interior space of quality.