Based on observed precipitation data from Shanxi Province between 2018 and 2020, the applicability of the FAST and FRT merged precipitation products in the CMPAS multi-source precipitation fusion system of the National Meteorological Information Center was evaluated in terms of spatial-temporal characteristics and categorical verification. The results showed that: (1) Both products reflect the daily precipitation characteristics in Shanxi Province, with deviation reduced by more than 60% from 2018 to 2020. (2) After the fusion of radar data during the flood season, the accuracy of FRT improved, particularly in areas such as the southern foot of the Taihang Mountains, the western foot of the Lüliang Mountains, and the Lin-Yun Basin. Additionally, FRT exhibited a higher correlation with observed heavy precipitation. (3) The diurnal variation of precipitation showed that hourly products tend to underestimate precipitation from early morning to afternoon during non-flood seasons, and exhibit delayed and weaker peak values during flood seasons. (4) Both products tend to overestimate weak precipitation, primarily due to a positive frequency deviation, and underestimate heavy precipitation, mainly due to a negative intensity deviation.
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