  With the exceptional sensitivity of the Five-hundred-meter Aperture Spherical
radio Telescope (FAST), we conducted observations of the neutral hydrogen (HI)
in the Circular Galactical Medium (CGM) of Andromeda's (M31) satellite
galaxies, specifically Andromeda II, NGC 205, and NGC 185. Initially, three
drift scans were executed for these satellites, with a detection limit of
$4\times10^{18}$ cm$^{-2}$ ( approximately $1.88\times10^3 M_{\odot}$ of HI
mass), followed by a more in-depth scan of a specific region. We discovered a
C-shaped HI arc structure sharing a position and line-of-sight velocity similar
to a stellar ring structure around Andromeda II, hinting at a potential
connection with Andromeda II. In the context of NGC 205, we identified two mass
concentrations in the northeast direction, which could be indicative of tidal
streams resulting from the interaction between this galaxy and M31. These new
lumps discovered could be very helpful in solving the missing interstellar
medium (ISM) problem for NGC 205. Observations regarding NGC 185 are consistent
with previous studies, and we did not detect any additional HI material around
this galaxy. These observational results enhance our understanding of the
evolution of these satellite galaxies and provide insight into their historical
interactions with the M31 galaxy.
