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The experimental measurement and image processing methods are combined to study the light scattering characteristic from the target, principle of the scaling ratio between the light scattering characteristic and the geometric dimension of the target is presented in this paper. The solar simulator is utilized as a light source which incidence the target with rough surface. The original experimental images must be measured by light receiver and data gathering system. Some image algorithms are be designed to process these experimental data. As a researching example, the imaging light scattering characteristic of two kinds of bigger and smaller simple targets include clubs, cylinders are discussed in detail. The image processed results are shown the scale ratio of the light scattering from target is proportional to its dimensional square. The important of our works is that the scaling rations of the light scattering characteristic can be used to make known the illumination of the whole dimensional detected target, which are useful for further study the complex target such as civilian industries, national defence, air and aero fields.