The characteristics of the S‐curve in a symbol (bit) synchronizer are important in evaluating the timing‐variance performance. However, the calculation of S‐curve is so tedious and complicated that almost all the S‐curves in the literature are drawn by computer simulations. A simple and quick graphic approach to draw the S‐curve for a symbol synchronizer is proposed in this paper, which can provide exactly the same S‐curve as that with the conventional method for high SNR case.