The properties of the total intensity of radiation side-scattered by the multiple particles when using linearly polarized incident light are studied experimentally. The scattering medium is the suspending liquid consisting of various concentrations of particles which are 0.065, 0.123, 0.220, 0.360, 0.494 or 1.240 μm in diameter and mixed into filtered, distilled water. The experimental results show that the influence of various diameters of particles on the intensity of total side-scattered light is obvious in relation to scattering angles. The change of the intensity is greater when the diameters of the particles are reduced (1.240~0.123 μm). When the diameters reduce further (0.123~0.065 μm), the change has slowed down. The influence of the particle concentration and the depths on the total intensity is minute, not as obvious as the influence of the change of the diameters of the particles. And in the detected plane, the intensity distribution of each component of the side-scattered light is angular-symmetric.