We obtained complete R and I light curves of GSC 02393-00680 in 2008 and analyzed them with the 2003 version of the W-D code .
It is shown that GSC 02393-00680 is a W-type shallow contact binary system with a high mass ratio q = 1.600 and a degree of contact factor f = 5.0 \% ( \pm 1.3 \% ) .
It will be a good example to check up on the TRO theory .
A period investigation based on all available data suggests that the system has a small-amplitude period oscillation ( A _ { 3 } = 0. ^ { d } 0030 ; T _ { 3 } = 1.92 years ) .
This may indicate it has a moderate mass close third body , which is similar to XY Leo .