[1]Key Laboratory of Computational Astrophysics,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China;
[2]Universite Paris-Sud,LAL,UMR 8607,F-91898 Orsay Cedex,France & CNRS/IN2P3,Orsay F-91405,France;
[1]Key Laboratory of Computational Astrophysics,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China;
[1]Key Laboratory of Computational Astrophysics,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China;
[3]School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 100049,China;
[4]Centerfor High Energy Physics,Peking University,Beijing 100871,China;
neutral hydrogen; 21 cm line; foreground model; whole sky map; simulation;