The method of experimental statistical analysis was applied to study the effect of concentration of lignin (X₁) and the pH of the reaction solution (X₂) on the values of specific parameters of the porous structure obtained organic lignin-tannin-formaldehyde (LTF) aerogels. Mathematical models relating the basic dependence of initial variables X₁ and X₂ with the predicted conditions to achieve the best performance of porosity (meso- and macropore volume) in LTF organic aerogels were obtained. Based on the evaluation of the mathematical model it was established that for Х₁ = 40,0% and Х₂ = 2,2 the maximum predicted value of the specific surface area of obtained organic aerogels is 587 m²/g. For factors Х₁ = 30%, and Х₂ = 2,54, the maximum value of the pore volume is about 2,16 cm³/g. Predicted optimal conditions to achieve the maximum values of surface area and pore volume were consistent with the experimental results, that determines the feasibility of their using to predict the results of synthesis of LTF aerogels with desired structural characteristics.