Abstract: Hemerocallis citrina Baroni is a characteristic vegetable and functional food with a large planting area and consumption, and high economic value in China.It is listed as one of the four major vegetarian delicacies.With the continuous extension and development of the Hemerocallis citrina industry, many studies on yellow flower have gradually been carried out, such as germplasm resource evaluation, cultivation technology research and development, medicinal value, genomics, transcriptome, metabolome, functional genes, functional substances, etc.,in order to provide reference for the comprehensive development of the Hemerocallis citrina industry.However, due to the fact that molecular biology, especially the combination of multiple omics, is still in its developmental stage in the study of Hemerocallis citrina,there is still a lot of room for exploration in specific traits or phylogenetic aspects of Hemerocallis citrina.This study systematically summarized the research progress of Hemerocallis citrina in germplasm resources, molecular biology, genomics, and functional substances, discusses the limitations and possible solutions in current research on Hemerocallis citrina,and looked forward to its future research development direction.