The Nanshan 1.2-meter optical telescope is a reflector telescope featuring an Alt-Azimuth mounting system and incorporates two Nasmyth focuses. One of the Nasmyth focus is dedicated to quantum communication experiments, with a focal length exceeding 13,000 mm and provides a field of view of no less than l’x  l’. The other focus, designed for astronomical observations, has a focal length greater than 9,400 mm and a field of view of at least 20’× 20’, equipped with a spectrometer. The spectrometer are equipped with two low-resolution gratings (R~1300, 7500) and one medium-resolution grating (R~18000), allowing switching between low and medium resolution modes. Currently, both focuses are actively engaged in quantum communication experiments and optical astronomical observations.