  Lijiang 2.4-meter Telescope(LJT), the largest common-purpose optical
telescope in China, has been applied to the world-wide astronomers since 2008.
It is located at Gaomeigu site, Lijiang Observatory(LJO), the southwest of
China. The site has very good observational conditions. Since 10-year
operation, several instruments have been equipped on the LJT. Astronomers can
perform both photometric and spectral observations. The main scientific goals
of LJT include photometric and spectral evolution of supernova, reverberation
mapping of active galactic nucleus, physical properties of binary star and
near-earth object(comet and asteroid), identification of exoplanet, and all
kinds of transients. Until now, the masses of 41 high accretion rate black
holes have been measured, and more than 168 supernova have been identified by
the LJT. More than 190 papers related to the LJT have been published. In this
paper, the general observation condition of the Gaomeigu site is introduced at
first. Then, the LJT structure is described in detail, including the optical,
mechanical, motion and control system. The specification of all the
instruments, and some detailed parameters of the YFOSC is also presented.
Finally, some important scientific results and future expectations are
summarized.
