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Soft-cancellation(SCAN)is a soft output iterative algorithm widely used in polar decoding.This algorithm has better decoding performance than reduced latency soft-cancellation(RLSC)algorithm,which can effectively reduce the decoding delay of SCAN algorithm by 50％but has obvious performance loss.A modified reduced laten-cy soft-cancellation(MRLSC)algorithm is presented in the paper.Compared with RLSC algorithm,LLR information storage required in MRLSC algorithm can be reduced by about 50％,and better decoding performance can be achieved with only a small increase in decod-ing delay.The simulation results show that MRLSC algorithm can achieve a maximum block error rate(BLER)performance gain of about 0.4dB compared with RLSC algorithm when code length is 2048.At the same time,compared with the performance of several oth-er algorithms under(1024,512)polar codes,the results show that the throughput of pro-posed MRLSC algorithm has the advantage at the low and medium signal-to-noise ratio(SNR)and better BLER performance at the high SNR.