Abstract: The Beijing Spectrometer, as a high-precision frontier experiment has performed important achievements in the tau-charm energy region, including high-precision measurements of the R value, determination of the mass of the tau lepton, observation of the anomalous behaviour and oscillatory effects of the baryon pair cross-section near the threshold, measurement of the phase difference between the electromagnetic and the strong interaction based on the scanning data of the charmoniums, and determination of the width of the electron channel fraction of χ_c1. These have provided accurate experimental tests of the Standard Model.