Abstract: Using the daily rainfall data collected from 100 meteorological observation stations from 1971 to 2017, based on the precipitation classification, the characteristics of summer precipitation in Xinjiang were studied by EOF decomposition, Mann-Kendall test and wavelet analysis. The results show that: summer precipitation is mainly concentrated near the Tianshan Mountains and decreased from north to south; the average summer rainfall in the past 47 years has shown a continuous increasing trend with obvious multi-decade-scale fluctuations, and occurred abrupt changes from less to more. The first four modes of EOF analysis successively reflect the change characteristics of summer precipitation in Xinjiang, which are generally consistent, opposite in south-north direction, opposite in east-west direction and opposite in central and surrounding areas. From the spatial distribution, the rainfall and rainy days of summer precipitation at all levels in Xinjiang show an obvious upward trend, and the climate change trend coefficient is basically consistent with summer precipitation, showing the spatial distribution characteristics of northern Xinjiang greater than southern Xinjiang, western Xinjiang greater than eastern Xinjiang, and mountainous areas more than basins and valleys. From the point of view of time change, the average rainfall and rainy days at all levels in summer in Xinjiang are mainly on the rise, and the upward trend of rainstorm is the most significant, followed by heavy rain, light rain and moderate rain. The average summer precipitation in Xinjiang shows multi-scale periodic oscillation characteristics.