When observing the blazars , we identified a new eclipsing binary GSC 03517-00663 .
The light curves of GSC 03517-00663 are typical EW-type light curves .
Based on the observation using the 1m telescope at Weihai Observatory of Shandong University , complete VRI light curves were determined .
Then , we analyzed the multiple light curves using the W-D program .
It is found that GSC 03517-00663 has a mass ratio of q = 0.164 and a contact degree of f = 69.2 \% .
GSC 03517-00663 is a deep , low mass ratio overcontact binary .
The light curves of GSC 03517-00663 show strong O ’ Connell effect , it was explained by employing a dark spot on the secondary component .