CAS Key Laboratory of Optical Astronomy National Astronomical Observatories Chinese Academy of Sciences Beijing 100101 ChinaSchool of Astronomy and Space Science University of Chinese Academy of Sciences Beijing 101408 China;
CAS Key Laboratory of Optical Astronomy National Astronomical Observatories Chinese Academy of Sciences Beijing 100101 ChinaSchool of Astronomy and Space Science University of Chinese Academy of Sciences Beijing 101408 China;
Galactic halo; spiral arms and Galactic disk; chemical composition and chemical evolution; kinematics and dynamics; rotation;
