Abstract: In order to examine the chemical composition characteristics of atmospheric precipitation in Guandu District of Kunming during the 13th Five-Year Plan period, pH, EC, K⁺, Na⁺, Ca²⁺, Mg²⁺, NH₄⁺, F^-, Cl^-, NO₃^-,SO₄^2- concentrations in 188 precipitation from January 2016 to December 2020 were analyzed by rank correlation coefficient, Pearson correlation analysis and enrichment coefficient. It was concluded that there was no acidification in precipitation. The EC showed a decreasing trend, indicating that the pollution degree of atmospheric environment was reduced and the ambient air quality was improved. The pH and EC showed a seasonal regular of winter > spring > autumn > summer. The ratio of SO₄^2-/NO₃^- showed a significant downward trend, and the rainfall type turn from sulfuric acid type/coal to mixed type during the time period. The analysis of enrichment coefficient showed that K⁺, Ca²⁺ and Mg²⁺ were obvious land-borne ions, Cl^- mainly came from Marine and human contribution, SO₄^2- and NO₃^- mainly were from human activities.