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We present a scheme for exploiting potential optimization of THz generation efficiency in a circular dichroism term.A special non-oollinear two-color configuration is applied to produce the ideal oircularly polarized lasers.Comparing terahertz generation from circularly polarized to linearly polarized lasers,we identify terahertz generated by oircularly-polarized two-colors has higher conversion efficiency,when the laser intensity was increased above the saturation intensity for optical-field ionization.