Using the hourly precipitation data of 111 national stations during 1991 to 2017 and the daily precipitation data of 115 national stations during 1971 to 2017 in summer (from June to August) in Inner Mongolia, the characteristics about the duration of short-time strong rainfall processes(STSRP) and daily rainfall(light rain, moderate rain, heavy rain, torrential rain, excessive torrential rain, extreme torrential rain) processes were studied. The results show that:(1) The longest duration of STSRP is 38 hours and the duration about 3 hours percentage is most in Inner Mongolia. Duration within 12 hours of STSRP has maximum deviation at 16:00 (Beijing time, after the same) to 18:00, but duration more than 12 hours of STSRP has maximum deviation at 03:00 in Inner Mongolia. Furthermore, the longer the duration of STSRP, the lower the extreme value of the hourly precipitation in Inner Mongolia. Since 2010, the frequencies of STSRP have increased in Inner Mongolia. Frequencies of 4~6 hours and 7~12 hours of STSRP increase obviously. But frequencies of 1~3 hours of STSRP reduce evidently in Inner Mongolia. (2) The frequencies of light rain process and torrential rain process have decreased in Inner Mongolia. However, in recent years, the long duration rainfall process in the light rain process, the moderate rain process and the torrential rain process are extremely excessive. The first extreme torrential rain process occurred in 2017. In Inner Mongolia, the longest duration of the extreme torrential rain is 2 days, but the longest duration of other daily rainfall processes is 10~15 days. The longest duration of the heavy rain is 15 days. Lasted 1 day of the light rain process and the moderate rain process have maximum proportion, but lasted 2 days have maximum proportion about the heavy rain process and the torrential rain process. The extreme precipitation of the daily rainfall process is easy to occur in the first three day. (3) Spatial distribution about the frequency and extreme value of duration hours or days, as well as extreme value of accumulative precipitation of STSRP and daily rainfall processes increase from west to east, the highest value appear in the eastern part of Inner Mongolia.
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