Unbleached hardwood pulp (AO “Mondi SLPK”) with the degree of penetration 94 PEp.u., Kappa number 20 and breaking length 9520 m was used for bleaching. The system approach applied in the research has included a mathematical modeling, standard and specific assessment techniques used for the industrial control and research practice devoted to pulp and paper production, using modern measurement instruments and computers. Thus, the analysis of experimental data and calculation of optimal parameters of pulp treatment were performed using software package for statistical data analysis Statgraphics Plus ver. 5.0 [8] and L&W FiberTester analyzer to determine the complex of properties of hardwood pulp samples.