To study the nature of the state Y(2175),a dedicated data set of e + e^-collision data was collected at the center-of-mass energy of 2.125 GeV with the BESⅢ detector at the BEPCⅡ collider.By analyzing large-angle Bhabha scattering events,the integrated luminosity of this data set is determined to be 108.49±0.02±0.85 pb^-1,where the first uncertainty is statistical and the second one is systematic.In addition,the center-of-mass energy of the data set is determined w...

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