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Proxima Centauri is known as the closest star from the Sun. Recently, radialvelocity observations revealed the existence of an Earth-mass planet around it.With an orbital period of ~11 days, the surface of Proxima Centauri b istemperate and might be habitable. We took a photometric monitoring campaign tosearch for its transit, using the Bright Star Survey Telescope at the ZhongshanStation in Antarctica. A transit-like signal appearing on 2016 September 8th,is identified tentatively. Its midtime, $T_{C}=2,457,640.1990\pm0.0017$ HJD, isconsistent with the predicted ephemeris based on RV orbit in a 1$\sigma$confidence interval. Time-correlated noise is pronounced in the light curve ofProxima Centauri, affecting detection of transits. We develop a technique, in aGaussian process framework, to gauge the statistical significance of potentialtransit detection. The tentative transit signal reported here, has a confidencelevel of $2.5\sigma$. Further detection of its periodic signals is necessary toconfirm the planetary transit of Proxima Centauri b. We plan to monitor ProximaCentauri in next Polar night at Dome A in Antarctica, taking the advantage ofcontinuous darkness. \citet{Kipping17} reported two tentative transit-likesignals of Proxima Centauri b, observed by the Microvariability and Oscillationof Stars space Telescope in 2014 and 2015, respectively. The midtransit time ofour detection is 138 minutes later than that predicted by their transitephemeris. If all the signals are real transits, the misalignment of the epochsplausibly suggests transit timing variations of Proxima Centauri b induced byan outer planet in this system.

Searching for the Transit of the Earth--mass exoplanet Proxima~Centauri~b in Antarctica: Preliminary Result