The genes are important signaling component in the photoperiod pathway and flowering regulation pathway. However, people still know little about their role in . To achieve a better understanding of the members of the gene family, reveal their evolutionary relationship and related functions involved in photoperiod regulation, we systematically analyzed the family members in genome. A total of 33 genes distributed unevenly on 16 chromosomes were identified in and could be classified into three subfamilies. The same subfamilies have relatively conservative gene structures, three-dimensional protein structures and promoter motifs such as light-responsive -elements. The collinearity analysis detected 37 pairs of repetitive genes in genome. A 67.7% of the genes were lost after genome polyploidization. In addition, the genes showed different tissue-specific expression patterns. A 81.8% of the genes were mainly expressed in leaves, indicating that they may play a conservative role in leaves. Subsequently, we tested the circadian expression profiles of nine homologous genes that regulate flowering in . Most genes exhibit several types of circadian rhythms, indicating that these genes are involved in the photoperiod pathway. As such, our research has laid the foundation for understanding the exact role of the family in the growth and development of rapeseed, especially in flowering.