Accurate simulation of light propagation in complicated biological tissues has been a research focus of tissue optics. By utilizing the latest published Monte Carlo software-Monte Carlo modeling of photon migration in voxelized media(MCVM), with the human structure database of the highest resolution in the world. It is obtained the distribution of the absorption in the forearm and the effect on light transport and distribution. The results indicated that the three-dimensional anatomic structrue influences the light transport and distribution obviously, and the simulation results were much closer to the real state by comparing with the results obtained previously by MCML (the Monte Carlo Modeling of light transport in multi-layered tissues) and layered tissue model. So the analysis provide the guidance to optical health care techniques, such as photodynamic therary and infrared therapy.