Abstract: To compensate for the uncertainty in drought monitoring due to scarcity of ground stations and data measurement, we selected three high spatial-temporal resolution precipitation products, CMFD,MSWEP and ERA5,for analysis.By using precipitation data from 15 ground meteorological stations in and around the Wujiang River Basin spanning 1979 to 2016,the accuracies of three precipitation products in the Wujiang River Basin and their suitability for drought monitoring in various time scales were analyzed and evaluated using the standardized precipitation index(SPI).The results revealed that CMFD and MSWEP demonstrate remarkable detection precision, accurately portraying the spatial distribution of annual average precipitation over the Wujiang River Basin, whereas ERA5 exhibits significant overestimation.On both seasonal and monthly scales, the correlation coefficients of CMFD and MSWEP exceed 0.9,indicating a superior data accuracy compared to ERA5.Furthermore, CMFD and MSWEP exhibit high consistency with ground stations in calculating SPI across different time scales, with correlation coefficients surpassing 0.94.Conversely, the consistency between ERA5 and stations diminishes as the time scales augment, resulting in an average correlation coefficient of merely 0.46.Although none of the three precipitation products emerged as a clear winner in portraying the spatial distribution of drought frequency, CMFD generally outperforms MSWEP and ERA5.CMFD also excels in capturing drought duration, intensity, peak and severity, followed by MSWEP and ERA5.In conclusion, CMFD and MSWEP provide valuable data support for drought monitoring in the basin, while the precipitation data quality of ERA5 necessitates further improvement.The outcomes of this research will contribute significantly to drought monitoring and early warning in the Wujiang River Basin.