Based on the precipitation data of 13 meteorological stations in Qujiang Basin from 1961 to 2020

this study used cumulative anomaly

Mann-Kendall test

wavelet analysis

and Kriging interpolation methods to analyze spatio-temporal characteristics of precipitation and extreme events variations. The results showed that the 60-year average annual precipitation was 1 126.17 mm in the Qujiang basin

giving a slow upward trend with a tendency rate of 6.9 mm/10 a. The annual precipitation fluctuated violently

with cyclical changes of 27 a and 15 a. The average annual precipitation increased from the west to the northeast. The area with high precipitation was located in the Wanyuan area in the northeast of the basin

while the area with low precipitation in the western Bazhong area. The annual precipitation tendency rate increased from the northwest to the southeast

and the precipitation tendency rate in the east and south was 10~15 mm/10 a. Precipitation in the Qujiang Basin changed seasonally

with a downward trend in spring and autumn

and an upward trend in summer and winter. The 5-year sliding average indicated that the summer tendency rate was 16.9 mm/10 a

but -7.7 mm/10 a for the autumn. Seasonal precipitation fluctuated significantly with many mutation points. The mutation points in spring

summer and autumn were mainly concentrated in 1961-1980 and 2010-2020

and the mutation points in winter concentrated in 1985-2005. The highest precipitation tendency rates in spring

summer

autumn

and winter were in the south

northeast

southeast and west of the basin respectively. Heavy rainstorm days in the Qujiang basin during the flood season averaged 4.28 days per year

showing an upward trend with a rate of 0.21 d/10 a in the studied 60 years. During the flood season

it fluctuated significantly

and there was a significant increase tendency in 1965

1983 and 1984. Heavy rainstorm days in the flood season had the periodic changes of 14 a and 21 a. The multi-year average of heavy rainstorm days showed an increasing trend from the southwest to the northeast. The upward trend in the southern part of the basin-Dachuan area was the fastest

which was 0.15 d/10 a higher than the average upward trend of the whole basin.