SO2 absorption process by Ca(OH)2 solution is the heterogenous chemical absorbtion between gas and liquid phase. The reaction occurs in the diffusion area and reaction rate of neutralization is very fast in kinetic term. For this reason the physical models can be used to describe more clearly the process. These model can demonstrate the influence of independent parameters on the objective function by the absorbed gas productivity, block-level coefficients, the absorption yield. Those are the base for scale-up scale-down the absorption process, that can be maximal 10 time smaller or lager. This is a effective scale transfonnation method for the technology systems to perfonn physical transition. Within the scope of the article, the studying of the physical models describes the influence of independent parameters on the yield of SO2 absorbed process.