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High-order harmonic generation (HHG) is a fundamental atomic and molecular process in strong laser fields that continue to attract much attention in the recent past,both experimentally and theoretically,[1-4]especially when the recent advances in laser technology have made possible experimental investigation molecular processes on an ultrashort time scale and ultra-strong laser intensity.[5-7] Due to the extra degrees of freedom,the response of molecules to strong fields is considerably more complicated than that of atoms.For diatomic molecules,the extra degrees of freedom are the inteuclear separation R,and the alignment of molecules[8] with respect to the laser field polarization,which opens a possibility of investigating such characteristics as the phase and polarization[9-11] of the harmonic radiation.