Abstract: According to the precipitation data of Yuxi City from 1963 to 2018,the precipitation characteristics of Yuxi City are analyzed using the method of precipitation comparison between urban and suburban areas.The influence of urban development on precipitation in Yuxi City is studied and results are obtained.The annual precipitation of Yuxi City is decreasing slowly,especially after 2000.The trend of decrease is obvious.The maximum monthly rainfall is in August and the minimum is in March.Moreover,the monthly precipitation in the urban area is more than that in the suburban area.Precipitation can be divided into the dry and the wet seasons.Precipitation is mainly concentrated in the rainy season from May to October.The precipitation in the dry season accounts for 15.83% and that in the rainy season accounts for 84.17%.In addition,the precipitation in the urban areas is significantly higher than that in the suburban areas in the rainy season.According to the precipitation days in Yuxi City,the most frequent is light rain and the least is heavy rain.There are more rainfall days in the urban areas than in the suburban areas.The effect of urban development on heavy rain and rainstorm is more obvious.In short,the development of Yuxi City has the trend of increasing precipitation in the city and the areas in its downwind direction.

Key words: Yuxi city, precipitation, characteristic, urbanization, analysis