The Monte Carlo method is introduced to simulate and analyze the influence of optical parameters of the turbid medium, such as anisotropy factor, on the temporal and spatial distributions and scattering-order distributions of ultrashort pulses. The result shows that when anisotropy factor or absorption coefficient decrease and scattering coefficient or propagation depth increase, both of the pulse duration and the beam size broaden and the proportion of scattering photons at high scattering orders increase.