Sidelink Synchronization Signal Block (S-SSB) is used for establishing synchronization between devices before communication which is crucial for downlink synchronization in sidelink. In this article, the evolution process of sidelink technology in different versions is summarized, then, the signal and transmission design of S-SSB is given, including the structure and resource mapping of S-SSB, as well as the generation of S-SSB's time-frequency position and sequence. Further, the difference between S-SSB and normal SSB is summarized. Afterward, this paper also provides the receiving base band algorithm which considers the timing offset (TO) and frequency offset (FO). Finally, a link-level simulator platform is designed to evaluate the performance of sidelink synchronization signal detection and the block error rate of the PSBCH, an analysis of the error rate of PSBCH resource blocks and the detection performance of the synchronization signal under different frequency offsets. Additionally, it also analyzes the detection performance of the synchronization signal when using a single-symbol synchronization signal.