Deterrence theory in criminal justice uses the sanction threats as the main explanatory factor, which is supposed to lead potential criminals to avoiding criminal commissions. Deterrence perspective assumes that people can calculate the benefit from a crime and the likely costs, and that people are willing and able to compare the former with the latter. Beccaria maintained the deterrence effects of the celerity, certainty, and severity with the same emphases. However, most of deterrence literature has focused on the certainty and severity isolating the celerity. This study examines utilitarian rationales for punishment, research on deterrence perspective, celerity effects of punishment, and speed trial laws. Finally, the refined meanings of the celerity in criminal justice system and the ways for advancing the understanding and application of the celerity in criminal justice system are explored.