  When observing the transiting extrasolar planets, we discovered a new W UMa
type binary GSC 03553-00845. Following observation was carried out using the 1m
telescope at Weihai Observatory of Shandong University. Complete BVR light
curves were determined. Using the W-D program, we analyzed the light curves.
Photometric solution reveals that GSC 03553-00845 is a W-subtype W UMa type
binary with a mass ratio of q=2.904, it is an overcontact binary system by a
contact degree of f=29.5% with a small temperature difference between the
components (\Delta T=206 K indicating a good thermal contact between the
components. More observation of GSC 03553-00845 is needed in order to analyze
the light curve variation and orbital period change.
