A comprehensive three-dimensional transient model is developed to analyze laser attenuation near substrate where the beam transmits through the converged titanium powder cloud. A ray tracing method is employed to calculate the intensity distribution in all the directions after the laser beam is partially absorbed and partially scattered by the powder cloud. The effect of laser wavelength and number of particles on the laser attenuation process is considered. The results show that the spatially uniformly distributed titanium powder cloud with a concentration of 0.01 g/mL exhibits an absorptivity of 5.47%. The laser attenuation process due to the powder cloud is barely influenced by wavelength and the attenuation increases as the number of particles increases. The simulated transmittance of power cloud at 1.06 μm fits the transmittance curve of particulate suspension.