Abstract: Compared with conventional light sources, flexible filament lamps have high luminous efficiency and long life, and are energy-saving and environmentally friendly. Compared with rigid filament lamps, flexible filament lamps have diverse and elegant shapes, and are suitable for various lighting scenarios. The research and application progress of flexible filament lamps were reviewed. The preparation technology, structure design and latest application of flexible filament were introduced in detail, and the future development prospect of flexible filament was discussed.