Parameter fitting between anomalous diffraction approach (ADA) theory and experimental data is applied to analyze scattering properties, which related with droplet size, refractive index of polymer in polymer dispersed liquid crystal (PDLC). Besides scattering from liquid crystal droplets, there are additional scattering factors, such as interface scattering, impurity scattering, and the scattering caused by non-uniform refractive index of the polymer matrix, so ADA model is modified. Parameter fitting approach is proposed to measure refractive index of polymer, radii of droplet, as well as volume percentage of liquid crystal, to measure the parameters of four types of PDLC, in which the diameter of the droplet is about 2 μm. The result indicates that the error of the test for refractive index of polymer is less than 5％, while for volume percent of liquid crystal, the maximum error reaches about 10％.