The characteristic of light transportation along the pericardium meridian line and its surrounding areas at the wrist is studied by using Monte Carlo method. Three simplified models for Monte Carlo simulation are built based on the anatomical structure. The light propagation along the pericardium meridian line, the tendon and the non-meridian line nearby are simulated separately. The simulation results show strong accordance with the previous experimental results that the light propagation along the pericardium meridian has an advantage over its surrounding areas at the wrist. Luminous flux in different layers on the three paths are calculated, and the results show that the optical transmission characteristics in this region is mainly affected by its underlying structure and its underlying tissue composition. Besides, light transportation in the underlying tissue of the pericardium meridian line also has an advantage and the advantage transmission significantly correlates with the closed anatomical structure of the underlying tissue.