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In order to improve the frequency band utilization and communication rate of single-carrier frequency domain equalization (SC-FDE) system, a prefix-free and suffix-free frequency domain equalization technology based on K-Nearest-Neighbors (KNN) channel identification algorithm is proposed.This technology constructs training data sets with pilots in different channel environments, and classifies them by using the KNN algorithm according to the characteristics of the training data under different channel conditions, and then determines the channel type and the maximum delay of the multipath channel.the optimal overlap-cut length of the frequency-domain equalization algorithm without prefix and suffix overlap-cut is reasonably determined by the maximum delay of the multipath channel, and then the in-fluence of multipath interference on the frequency domain equalization data without prefix and suffix is eliminated, and the optimal demodulation performance is achieved. The simulation shows that the KNN-based overlap-cut algorithm has basically the same performance compared with the 50% overlap-cut method recommended in the paper, that is, when the bit error rate is 10-3, the signal-to-noise ratio dete-rioration is not more than 0.5 dB. This algorithm accurately determines the optimal overlap length, re-duces a large number of invalid overlap lengths, ensures the excellent bit error performance of the system in multipath channels, and achieves a balance between performance and complexity.