The XMCD endstation, in connection with the BL12B-a beamline, is designed to study magnetic films and bulk samples consisting of 3d states of transition metals (TM) or the 4f states of some rare earth (RE) elements by soft x-ray magnetic circular dichroism spectrocscopy.The beamline covers a photon energy range of 100-1000 eV with a normal resolution of 1000@1000eV. The flux is on the order of 108 phsc @1000eV and the beam size at the sample position is about 2mm (h) x1mm (v). The right- or left-circularity polarized soft x rays selected from below or above the horizontal beam orbit are produced by a bending magnet and monochromized with a varied line-spacing plane grating (VLSPG) monochromator and refocused by a toroidal mirror. Three detection options including the sample drain current (TEY), partial electron yield (PEY) and total fluorescent yield (TFY) can be met for different experiments. Two types of electromagnets including dipole and octupole will be equipped for XMCD and XMLD measurements in one year. The theoretical peak field intensity is 1 Tesla.