As nucleation effectiveness， the nucleation rate of artificial ice nuclei （AIN） also is one of the most important properties of seeding agents in weather modification. But it was rarely paid attention in the bypast field experiments and operations. The chemical kinetic approach is employed in this study. The results show that the nucleating rate, efficiency and even the nucleating mechanism of these pyrotechnics are different. For different aims of weather modification operating and different type clouds, we shall choose different seeding agents with different nucleating rates.