Abstract: Understanding the characteristics of precipitation in mountainous areas is of great significance for studying local climate, eco-environmental changes, and natural disaster prevention. To investigate precipitation characteristics and variations between the two sides of the main peak of the Min Mountains, this study analyzes regional precipitation characteristics and variations based on daily precipitation data from 1961 to 2020 in Songpan County (west side) and Pingwu County (east side). Multiple approaches are employed, including the dynamic wet-bulb temperature threshold algorithm, standardized extreme precipitation indices, and backward air mass trajectory simulation. The results indicate that: (1) The precipitation on the eastern side of the Min Mountains is higher than that on the western side, but the number of precipitation days is fewer. The precipitation in the west consists of light rain/snow, moderate rain/snow, heavy rain/snow and blizzards, with the precipitation concentrated from May to October. Precipitation on the east side shows a unimodal annual distribution, heavy rain and rainstorm frequencies are notably higher than those on the western side, and precipitation mainly occurs from May to September. (2) Overall, precipitation on the west side of the Min Mountains shows a non-significant increasing trend, whereas total precipitation on the east side shows a non-significant decreasing trend. However, light rain and heavy rain in the east have significantly increased and decreased, respectively, and the changes have been most pronounced in the past 20 years. The significant increase in heavy precipitation on the west side and the significant decrease on the east side are important reasons for the differences in precipitation responses to climate change between the two sides of the Min Mountains. (3) There has been no significant abrupt change in precipitation on either side of the Min Mountains over the past 60 years, but heavy and extreme precipitation on the east side has decreased significantly since the start of the 21st century. Overall, there are significant differences in precipitation characteristics and climate change responses between the two sides of the Min Mountains. In the future, attention should be paid to the occurrence patterns of high-magnitude precipitation and changes in extreme precipitation events.