Effects of fine particles precipitated during annealing and large dispersed particles of deformed primary inclusion on progress of recrystallization and generation of new grains were examined. Effects of primary inclusion particles are closely related to their interparticle spacing. The nucleation rate increases with decrease of the spacing. The increase of the rate of Al-Fe-Si alloys is, however, smaller than that of Al-Fe alloys. The particles of primary inclusion in the Al-Fe alloys are also effective to prevent the grain growth at high temperatures. This effect is also related to interparticle spacing of the particles. The interparticle spacing is related to the dendrite arm spacing, decreasing with decrease of the latter.