  We present Cousins $R$ and $I$ band photometry of variable stars in a
$\sim13'\times 13'$ region in the disk of M31 galaxy, obtained during 141
nights. Of the 26 Cepheid variables present in the region, two are newly
discovered, 11 are classified as Cepheids for the first time and 13 are
confirmed as Cepheids. The extensive photometry of these Cepheids enabled us to
determine precise phase and amplitude of pulsation which ranges from 0.11 to
0.48 mag in $R$ band. The period of variability ranges from $\sim$7.5 to 56
days. The period-luminosity diagram is used to derive a distance modulus of
24.49$\pm$0.11 mag for M31 galaxy. We also report variability in 333 other
stars, of them, 115 stars appear to be long period variables, 2 suspected
eclipsing binaries and remaining 216 are irregular variables.
