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A method to describe the generation channels of high-order harmonics is proposed.According to this method,the mechanism of generation-channel interference of high-order harmonics is revealed clearly.We take the anharmonic oscillator driven by bi-chrome fields as an example to illustrate that this method can be used to understand the effect of generation-channel interference.","A method to describe the generation channels of high-order harmonics is proposed.According to this method,the mechanism of generation-channel interference of high-order harmonics is revealed clearly.We take the anharmonic oscillator driven by bi-chrome fields as an example to illustrate that this method can be used to understand the effect of generation-channel interference.