Abstract: Based on the precipitation observation data of Daguan Mountain in Wuxi, Chongqing, in the eastern mountainous area of Southwest China from January 2019 to December 2020, the gradient variation characteristics of precipitation with altitude were analyzed. The results showed that from 2019 to 2020, the precipitation generally increased with the increasing of altitude, and the average change rate of precipitation with altitude was 1.32% / 100 m, the maximum precipitation height was about 1900 m. The average change rate of precipitation with altitude was higher in summer and autumn, lower in winter and spring. The average change rate was 3.31 mm/100 m in summer, 1.39 mm/100 m in autumn, 0.50 mm/100 m in winter and 0.67 mm/100 m in spring. The average change rate of precipitation with altitude was the highest in July, up to 5.06 mm/100 m, and the lowest was in January and November , 0.23 mm/100 m and 0.29 mm/100 m respectively. The linear trend of total precipitation days and light rain days with altitude was obvious, the average rising rates were 2.86d/100 m and 2.56d/100 m respectively. The number of heavy rain days was the largest at about 1900 m above sea level, and the number of rainstorm days was the largest at about 2500 m above sea level. To the daily variation of precipitation, the precipitation and the precipitation intensity reached the maximum during 06:00 to 09:00. The precipitation frequency also increased with the increasing of altitude. The precipitation frequency at high altitude reached the highest at about 15:00. The variation of precipitation with altitude was closely related to the weather process. The precipitation in the process of continuous cloudy and rainy weather increased gradually with altitude. The precipitation in the rainstorm process increased with the increase of altitude. The correlation between single process precipitation and altitude in local shower was not obvious.