We demonstrate light focusing through scattering media by introducing particle swarm optimization for modulating the phase wavefront.Light refocusing is simulated numerically based on the angular spectrum method and the circular Gaussian distribution model of the scattering media.Experimentally,a spatial light modulator is used to control the phase of incident light,so as to make the scattered light converge to a focus.The influence of divided segments of input light and the effect of the number of iterations on light intensity enhancement are investigated.Simulation results are found to be in good agreement with the theoretical analysis for light refocusing.