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GU Ori was observed with the 1m telescope at Yunnan Observatories in 2005. Todetermine its physical properties, the Wilson-Devinney program is used. Theresults reveal that GU Ori is a W-subtype shallow contact binary with a moremassive but cooler star 2. The mass of its two component stars are estimated tobe $M_1 = 0.45M_\odot$, $M_2 = 1.05M_\odot$. The O'Connell effect was reportedto be negative on the light curves observed in 2005. However, it changed to apositive one on the light curves observed from 2011 to 2012. The mean surfacetemperatures of star 2 ($T_2$) determined by the two sets of light curves weredifferent, which may result from stellar activities. The O - C diagram showsthat the period of GU Ori is decreasing at a rate of$dP/dt=-6.24\times{10^{-8}}day\cdot year^{-1}$, which may be caused by masstransfer from star 2 to star 1 with a rate of $\frac{dM_{2}}{dt}= -2.98\times{10^{-8}}M_\odot/year$. GU Ori is a contact binary with quite highmetallicity.

Photometric Investigation of the Contact Binary GU Ori with High Metallicity