To construct lighting model of the real world is one of the critical technologies in augment reality. The theory of lighting modeling used in Computer Graphics(CG) is applied in our research. At first

the position of the real light-source is conjectured from the lighting and shade of the registration image elementarily by using ray tracking algorithm. Then the virtual light-source and virtual fiducial are constructed in the CG environment

in which

Phong model is used to draw the light effect. By comparing the CG scene with the real image

we can modify the parameters of lighting model over and over again

until the lighting effect of the CG scene is similar to that of the real image. It is proven that this method works well in the indoor AR system. Our method could be used feasibly in most applications after some improvement.