Cardiocrinum giganteum is an endemic species of east Asia which is famous for its showy inflorescencemedicinal bulbs. Its inflorescence is a determinate racemethe flowers bloom synchronously. Morphological observationtime-course transcriptomic analysis were combined to study the process of inflorescenceflower development of C. giganteum. The results show that the autonomic pathway, GA pathway,the vernalization pathway are involved in the flower formation pathway of C. giganteum. A varied ABCDE flowering model was deduced from the main development process. Moreover, it was found that the flowers in different parts of the raceme in C. giganteum gradually synchronized during development, which is highly important for both evolutionecology. The results obtained in this work improve our understanding of the processmechanism of inflorescenceflower developmentcould be useful for the flowering period regulationbreeding of C. giganteum.