Different precipitation events were divided into short duration, medium duration, long duration, and persistent precipitation at 2-hour intervals by minute precipitation data of 12 national meteorological stations in Tianjin from 1979 to 2020 during the warm season (May to September). The spatial and temporal variation characteristics of precipitation, precipitation intensity and precipitation frequency of precipitation events with different durations were analyzed. The results show the variation of precipitation, precipitation frequency and ratio are consistent with an increasing trend in short duration and the middle duration and a decreasing trend in long duration and the persistence. The precipitation intensity increases in each duration. The time range of high value areas of short duration precipitation and intensity have expanded from the traditional "seven down and eight up" to mid -June to late August, while the time range of high value areas of long duration and persistent precipitation and intensity have become more concentrated. There are different spatial characteristics and trends in precipitation and intensity with a significant increase in short duration precipitation and a significant decrease in persistent precipitation, corresponding to an increase in precipitation intensity. This change is particularly significant in urban and Binhai New area, which may be related to changes in urban thermal environment.