Rheological analysis (dynamic mechanical spectroscopy) was used to give a fairly complete description of kinetic and structural-mechanical characteristics of high conversion polymerization of dimethyldiallylammonium chloride in dilute solutions in a relatively wide range of variation of monomer and initiator concentrations. Analytical formulae were derived which link rheological and kinetic parameters of the reaction system during polymerization. A physical model was proposed for structure-formulation in polymerization in dilute solutions, including stages of M increase and the formation of a fluctuation branching network. Parameters of this model were quantitatively evaluated.