Taking Dushu Lake Campus of Soochow University as an example, through the calculation of daylight factor and Ecotect simulation, the indoor light environment analysis were carried out by using the method of investigation, instrument test, Ecotect numerical simulation, statistical analysis and so on. The effects of different materials and lighting form on indoor light environment were studied by according to comparative analysis of data .In order to get the right interior daylight factor, we should choose light-colored walls and the top surface, architects should not add too much decorative lines when we design the facade, window's shape, size, position level should be based on the size of the interior space, the shape and the height.