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Orthogonal frequency division multiplexing (OFDM) has been one of the mainstream technologies in the fields of modern wireless communications. However, its own high peak to average power ratio (PAPR) problem can impair the performance of system, which has greatly restricted its wide applications. Partial transmit sequence (PTS) was proposed for improving the PAPR performance of OFDM systems. But its introduction greatly increases the computational complexity of the system. In this paper, a low-complexity PTS scheme is proposed based on the dominant time-domain samples, and two new metrics for choosing these samples are introduced. In addition, to further reduce the computational complexity, grouping method has been involved in proposed scheme. Simulation results indicate that the proposed low-complexity PTS scheme can provide a perfect PAPR reduction performance with more computational complexity savings.