Abstract: In order to explore a flexible and efficient multiband frequency conversion scheme based on optical frequency comb, a system consisting of one dual-drive Mach-Zehnder modulator (D-MZM) and two double-parallel Mach-Zehnder modulators (DP-MZM) was used. D-MZM was drived by the received radio frequency signal, single side band modulation was carried out and then one carrier and +1 order side band were obtained. Two DP-MZMs were used as two optical comb generators, and two optical frequency combs with different phase coherence and different center frequencies were produced. The influence of DC bias point drift on frequency conversion efficiency of the system was also studied. After theoretical analysis and experimental verification, the results show that the proposed frequency conversion system can convert 15GHz microwave signals in Ku band into 3GHz, 7GHz, 11GHz, 19GHz, 23GHz and 27GHz. The signal-to-noise ratio of output microwave signal can reach 28.82dB~29.99dB. The drift of DC bias point is within the range of -10% to 50%. The influence is obvious. This method can provide multiband frequency conversion for a satellite communication system to meet requirements of multiband communication.