The crystallization of dendritic deposits during a galvanostatic electrolysis and a contact deposition of metals from aqueous solutions is modeled. Structural changes in a deposit are characterized by its distribution by radii of apexes of growing dendrites. The calculation is carried out by solving a set of differential equations by the Runge–Kutta method within the Mathcad Plus 6 package. The reduction of metals with different exchange currents during electrolysis and with different exchange currents of the component being reduced during cementation is considered. The calculated results qualitatively conform to available experimental data.