Abstract: Beginning with summarizing the technology of diffuse optical tomography and its difficulties, a new tomography model for highly scattering media was proposed. Various of complex physical processes would occur when light transported in highly scattering media, such as transmission, diffusion, reflection, refraction, diffraction, etc. All these complex physical processes were simplified into transmission and diffusion with the new model. Compared with the existing model based on radiative transfer theory, the new model is more simple, more intuitive, less amount of calculation and higher reconstruction accuracy. The work procedure of the new model was described in detail. A new algorithm of tomographic reconstruction for the model was also designed, and its implementation steps were described. The simulation experiment about the model and the algorithm is made to verify the effectiveness of the algorithm.