Abstract: Orthogonal frequency division multiplexing has been seen as one of the core techniques of 4G for its high spectral efficiency and good performance in fading radio channels. However, the major drawback of OFDM system is that the OFDM signal can have high peak to average power ratio (PAPR). The partial transmitted sequences (PTS) scheme reduces the probability of the appearance of high peak value using a set of appropriate phase rotation vectors, so that the PAPR of a OFDM signal can be reduced without distortion of the signal. The conventional PTS scheme, due to its high computational complexity, cannot be implemented in real communication systems, so, it is necessary to reduce the complexity of conventional PTS scheme while insure effective reduction of the OFDM signal's PAPR. In this paper, we discussed and compared the characteristics of various kinds of improved PTS schemes, and finally, point out the research trend of the PTS scheme.