The dynamic process of entropy-driven colloidal particle crystallization within cylindrical con?nement was investigated by Brownian dynamics simulations. In these densely-packed systems, the influence of volume fraction and number of particles on the crystal morphology and structure by cylindrical con?nement, as well as the crystallization process and growth mechanism of colloidal particles were studied, and the evolution of cylindrical crystal structure was simulated. It is found that at low volume fraction, the particle packing structure is gradually layered from concentric circles with the increase of the number of colloidal particles and cylindrical diameter, which is cue to the competition between boundary effect and lattice defect. Particularly, the entropy plays a dominant role in this process. Our findings provide insights into the control of crystal morphology of colloidal particles, deepen the understanding of entropy-driven ordered behavior in colloidal systems, and present a new approach for the structural construction and dynamics regulation for self-assembly of various colloidal systems.