To improve the flatness of optical frequency combs （OFC） and the number of comb lines, a scheme for generating flatOFC based on dual light sources and polarization technology is proposed. This scheme first achieves eight flat comb lines otherthan the main carrier by adjusting the modulation index of the optical phase modulator（O-PM）. Then, it utilizes polarization technology to alter the peak power at the main carrier, resulting in a flat OFC. The simulation results indicate that when the O-PMmodulation index is set to 2.62, which corresponds to an amplitude E1 of 1.67 V for the radio frequency signal E1（t）, eight flat comblines excluding the central carrier can be generated. Under the conditions of a polarization controller angle φ of 29.8° and a linearpolarizer angle α of 45°, this scheme can produce a highly flat OFC with 10 comb lines, a flatness of 0.01 dB, and a side-modesuppression ratio of 6.15 dB. Compared to a single light source, the influence of linewidth changes in dual light sources on flatness is smaller.