Based on the gauge-based daily and hourly precipitation data from April 2014 to December 2015 in the upper reaches of Huaihe Basin (above Honghekou estuary), the comprehensive evaluation indices were used to evaluate the monitoring accuracy of TRMM 3B42 v7 and GPM IMERG in the daily and hourly scales. The results show that: on the daily scale, the correlation between GPM product and gauge-based precipitation is slightly better than TRMM with correlation coefficient 0.87, and the error is slightly larger than that of TRMM, but both are controlled < 0.8 mm/d. In terms of precipitation detection capability, the consistency between GPM and gauge-based precipitation is significantly improved, especially in light and moderate precipitation events, which shows that GPM product can be used for hydrological simulation and water rescources evalution on the daily scale. At the hourly scale, the monitoring capacity of TRMM for six extreme precipitation events is relatively stable, slightly underestimates ( BIAS average is -6% ). However, the reliability of GPM for different extreme precipitation events is lower, indicating that the monitoring accuracy of GPM product in extreme precipitation needs to be improved.