The PRRs family gene, which serves as a major component of the core clock of the circadian clock, plays important role in inhibiting the plant flowering, and manipulating ABA-dependent stress resistance and the accumulation of plant biomass. This article reviews the structural characteristics of the PRRs family genes, the photoperiod regulation model and its responses under stress treatments, in order to provide a theoretical reference for further study of the function of PRRs family genes and the cultivation of high-quality and broad-suit crop varieties.