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In order to improve measurement accuracy and stability, reduce the cost of measurement, this paper in-depth study of MIE scattering theory, puts forward a design of particle size measurement system based on improved inversion algorithm. Improved regularization operator K of inversion algorithm can reduce the energy residual, increase smoothness; added preprocessing algorithm can realize multimodal inversion accurately. By use of laser, Fourier lens, photoelectric sensor to collect electrical signals containing particles information, and through conditioning circuit for signals processing, using improved inversion algorithm analyze and calculate the value of particle size distribution. Through experimental analysis, particle size measurement system based on improved inversion algorithm can achieve particle size measurement accurately, with stable and reliable system performance.