In order to solve the problem of low real-time calculation accuracy of dynamic signal frequency and amplitude, Dongfang has proposed the YLS high-precision frequency and amplitude calculation method. This technology is used for accurate frequency and amplitude measurement of dynamic signals, breaking through the limitation of FFT accuracy in general dynamic signal analyzers. The accuracy of software algorithms can reach 15-16 decimal places, and the frequency accuracy of actual measurement systems combining software and hardware can reach 8 decimal places. This method improves the accuracy by 6-7 orders of magnitude compared to traditional algorithms.