  In the past few years, Chinese astronomical community is actively testing
astronomical sites for several new optical/infrared ground-based telescopes.
These site testing campaigns conducted were mainly focused on fundamental
performances of the site, such as cloud coverage, seeing, temperature, etc.
With increasing interests in sodium laser guide star adaptive optics for these
new telescopes in the Chinese astronomical community, it is interesting to
investigate the performance of the laser guide star at these sites, especially
considering that the sodium laser guide star's on-sky performance is
significantly influenced by sites' local performances, such as geomagnetic
field, sodium layer dynamics, density of air molecule, etc. In this paper, we
studied sodium laser guide star's performance of a 20W class Quasi-CW pulsed
laser developed by TIPC with numerical simulation for five selected sites in
China.
