Abstract: In this paper, a dual-band vortex electromagnetic wave metasurface is designed. The metasurface consists of a dual-symmetric C-ring unit cell with transmission lines. By varying the length of the phase delay line loaded inside and outside the unit cell, a phase coverage of 360° can be achieved at both frequencies, Moreover, the phase change can be controlled independently with less coupling inside the unit cell. Based on the unit cell, a dual-band reflective metasurface with 13×13 unit cells operating at 8 GHz and 18 GHz is designed. Simulation results show that the designed metasurface generates OAM vortex waves of l=+1mode at both 8 GHz and 18 GHz, with a gain of 16.2 dBi at 8 GHz and 21.6 dBi at 18 GHz, achieving good dual-band OAM vortex beam characteristics.