Owing to their unique collective properties, colloidal crystals are attracting more and more attention. They offer us a novel method to fabricate functional materials. Nucleation and growth processes are two key factors for us to obtain colloidal crystals. Here, by changing the reaction temperature, we realized precise control of nucleation and growth rates of colloidal crystals. For the saturated solution of Cs-Pb-Br nanoparticles, a relevantly fast cooling led to nucleation of colloidal crystals, and then a very slow cooling was applied to grow colloidal crystals. Through this method, we acquired ordered cubic colloidal crystals, which was made up of 10 nm cubic Cs-Pb-Br nanoparticles. The size of those uniform colloidal crystals was about 2 μm. We found out that precursors concentration, solvents, which would influence the nucleation and growth processes, had a great influence on the final product. Through time sequence experiment, we briefly described the growth dynamics of colloidal crystal, and built the relationship between quality of colloidal crystals and nucleation/growth rates.