Abstract: The depolarization effect and scattering strength were simulated by CST, and far-filed scattering theory also was analyzed, linearly polarized light at the frequency of 563 THz(wavelength 532 nm, green light) was taken as the probe light. The far-field scattering filed performance of influencing factors were analyzed based on the method of finite integral of CST. Simulation result shows this new model can accurately analyze and reflect forward and backward scattering, all directions of the scattering strength and depolarization characteristics can be got in figures, these characters also affected by the bubble radius, scatter angle and water absorption coefficient. These results provides important basis for subsequent research.