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The CCD photometric data of the EW-type binary, II CMa, which is a contactstar in the field of the middle-aged open cluster Berkeley 33, are presented.The complete R light curve was obtained. In the present paper, using the fiveCCD epochs of light minimum (three of them are calculated from Mazur et al.(1993)'s data and two from our new data), the orbital period P was revised to0.22919704 days. The complete R light curve was analyzed by using the 2003version of W-D (Wilson-Devinney) program. It is found that this is a contactsystem with a mass ratio $q=0.9$ and a contact factor $f=4.1%$. The high massratio ($q=0.9$) and the low contact factor ($f=4.1%$) indicate that the systemjust evolved into the marginal contact stage.

CCD photometric study of the W UMa-type binary II CMa in the field of Berkeley 33