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In view of the problem of blind area in detecting weak iso-frequency signals of Duffing oscillator, an anova technique is proposed to detect the signal in blind area.By analyzing the condition of detecting blind area, the range of phase of the signal to be measured with the same frequency is obtained, and the variance calculation of the chaotic system and the signal to be measured is realized.The feasibility of the method is proved by experiments.It can also detect the existence of difference frequency signal.The results show that this method is a signal processing method with a lower threshold of SNR, which provides a basis for weak signal detection.