Synchronization is a critical aspect to OFDM systems.There are classic algorithms of OFDM synchronization, S C algorithm and PARK algorithm,however,there is platform effect in S C algorithm,and the timing effect of the PARK algorithm in low SNR case is poor.In view of this,we propose an inproved symbol synchronization algorithm.In view of this,we propose an improved synchronization algorithm.This algorithm basically eliminating the plateau effect due to the presence of traditional algorithms generated by cyclic prefix with the method of improving the pre-training sequence cyclic prefix CP. Simulation results show that: the improved algorithm can eliminate the defect of the traditional algorithms,while eliminating the platform effect,in the mean time, this algorithm can have relatively good effects in the case of low SNRas well as in the multi-path fading channel environment.