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High harmonic emission occurs when an electron,liberated from a molecule by an incident intense laser field,gains energy from the field and recombines with the parent molecular ion.For molecules,multichannel dynamics play an indispensable role in this process.We use time-dependent Hartree-Fock(TDHF)methods to calculate molecular high-order harmonic generation for CO2 molecules aligning along the two-color laser fields.It is found that the intensity of even harmonics modulated periodically by phase difference of two-color laser fields.For some certain even harmonics,the modulations are weaker comparing to the other even-order harmonics because of the interference between HOMO and HOMO-2 channel.