From the O− C curve for V345 Gem, it is discovered that there exists a long-term period increase with a cyclic variation. From the log L–log M diagram of the binary-star evolution, the primary component is an evolved star. The absolute physical parameters for V345 Gem were obtained first. The contributions of the third light to the total light are approximately 20% in the BVR bands. The asymmetric light curves in 2008 may be attributed to the activity of starspot, whose area is up to 1.55% of the area of the more massive component. The results indicated that V345 Gem is a low mass ratio overcontact binary with f = 72.9%(☓.1%). From those observations, two sets of photometric solutions were deduced using the 2003 version of the W–D program. When comparing the light curves in 20, it is found that there appears to be an O'Connell effect in the light curves of 2008. CCD photometric observations of the visual binary, V345 Geminorum, obtained from 2007 January 24 to 2009 March 22, are presented.
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