The study analyzed how rainfall patterns have changed over time in the Dianchi Basin. They looked at data from 1953 to 1987 and 2007 to 2012, using various statistical methods. The results showed that rainfall has increased in some seasons but decreased in others. Overall, there was a fluctuating trend in annual rainfall, with a significant decrease in recent years. The spatial distribution of rainfall also varied, with some areas experiencing more heavy rain events while others had more light rain.