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Reanalysis precipitation products are important datasets for precipitation estimates over ungauged areas. The objective of this study was to evaluate the accuracy of the newly released fifth-generation reanalysis product of the European Centre for Medium Range Weather Forecasts (ECMWF), i.e., ERA5, for precipitation estimates over Chinese Mainland during 2003–2015. In this study, we evaluated the ERA5 reanalysis data using gridded gauge precipitation. Both categorical and continuous verification scores were calculated. The results show that the detection capacity of ERA5 varies across the four sub-regions of Chinese Mainland. ERA5 tends to misdetect daily precipitation events in the south of the northwestern arid climate (NAC) and north of plateau climate (PC) zones. In addition, it is more difficult for ERA5 to accurately detect moderate or higher daily precipitation events (above 10 mm/day). Error analysis …