and physical mechanism of polarized light generation was also described. We calculated the polarization state of insert device (3W1 wiggler) of Beijing Synchrotron Radiation Facility (BSRF)
which was installed in the ring of Beijing Electron Positron Collider (BEPC). The calculated results were given
which is very important for applying polarized light of 3W1B beamline at BSRF in the future.