Abstract: Using the monitoring data of acid rain of the Dachuan District National Basic Meteorological Station from 2008 to 2022, the variation characteristics of pH value and K value of 1233 precipitation samples and their relationship with meteorological factors were statistically analyzed. The results showed that in the past 15 years, the average pH value of Dazhou City was 6.03, with a slightly increasing trend. The order of pH value from high to low in each season was summer > autumn > spring > winter. The average K value was 71.1 μs·cm⁻¹, with a decreasing trend, the order from high to low in each season was opposite to that of pH value, that is, winter > spring > autumn > summer. Atmospheric precipitation was mainly neutral, and the frequency of acid rain was 27.49%. When the ground wind direction was ENE, the frequency of acid rain was the highest, and the frequency of strong acid rain corresponding to the NE wind direction was the highest. From the correlation point of view, pH value was positively correlated with wind speed, and K value was negatively correlated with precipitation. In recent years, the acid rain in Dazhou City has been significantly improved, and the atmospheric environment governance has achieved remarkable results.