Since the join of the group “Solar Stokes spectrometry and theoretical research” in Yunnan Astronomical Observatory, CAS, into national astronomical observatories, we have made a thorough improvement for the existed polarization package in the 50 cm solar spectroscopy telescope during the past year. The modulation mode has been changed from D.C. to A.C., and a calibration system for polarization measurement was added. The design and processing of both mechanical and electronic-controlling systems for the polarization measurement were accomplished in Feb. 2000. Optical calibration was finished in March, 2000. Software programming for the polarization de-modulation and image processing were completed early in April, 2000. Since late April, 2000, we have undergone successful Stokes spectrometry to some active regions during solar cycle 23. The accuracy of the polarization measurement can be up to 2×10^-3, well approaching to the world level. This has laid a good foundation for the future scientific research. The combination of this facility with solar magnetic telescope in Huairuo Solar Observing Station will step up nation's level in the solar vector magnetic and velocity field investigation. The detailed method of polarization measurement and some of our recent observational results are given also.
    Further improvement of the method of polarization measurement by substituting single beam analysis with double beam will be carried out. The accuracy is expected to be 5×10^-4, thus making it possible to acquire the magnetic field information not only from activity regions but also from quiet areas. Furthermore, it will be feasible to measure the  second solar spectrum, leading to a much more wide usage of this telescope.