Abstract: A new method for accurate reconstruction of the harmonic signals from bispectrum is presented. Based on the analyses of the measured harmonic signal, a sinusoid signal with a zero-phase,one-amplitude and half of the fundamental frequency combines with the measured signal to form a combined signal, and then the bispectrum analysis is carried out to reconstruct the phase and the amplitudeof the measured signal accurately. Without the zero-phase assumption of the fundamental component,the phase shifting between the calculated Fourier phase and the true Fourier phase in the existing signalretrieval method based on bispectrum is eliminated by using the new method. The simulation resultsshow the effectiveness of the new method.