Kinetics of cells’ nucleation at cellular decomposition of solid solutions in copper alloys with 3.68—6.00 at.% of titanium is investigated within the temperature range of 848—973 К. Values of cells number per unit volume, $N$, at various times of ageing are obtained, using numerical statistical metallography. Among main parameters of kinetics of cells’ nucleation, namely, a number of probable potential places of cells’ nucleation per time unit, $\bar{N}$, frequency of acts of cells’ formation per time unit, $v_{S}$, and period of instability of this process are determined. The cells’ formation rates, $\dot{N}$, at various ageing temperatures are determined, and their temperature dependences are plotted. These dependences demonstrate nonstationary nature of this value.