  We have investigated the variable stars in the field surrounding NGC 2355
based on the time-series photometric observation data. More than 3000 CCD
frames were obtained in the V band spread over 13 nights with the Nanshan
One-meter Wide-field Telescope. We have detected 88 variable stars, containing
72 new variable stars and 16 known variable stars. By analyzing these light
curves, we classified the variable stars as follows: 26 eclipsing binaries, 52
pulsating stars, 4 rotating variables, and 6 unclear type variable stars for
which their periods are much longer than the time baseline chosen. Employing
Gaia DR2 parallax, kinematics, and photometry, the cluster membership of these
variable stars were also analyzed for NGC 2355. In addition to the 11 variable
members reported by Cantat-Gaudin et al. (2018), we identify 4 more variable
member candidates located at the outer region of NGC 2355 and showed
homogeneity in space positions and kinematic properties with the cluster
members. The main physical parameters of NGC 2355 estimated from the two-color
and color-magnitude diagrams are log(age/yr) = 8.9, E(B - V) = 0.24 mag, and
[Fe/H] = - 0.07 dex.
