By using the observational data of Yuqing national meteorological station from 1981 to 2017 and the observation data of 9 regional meteorological stations from 2012 to 2017, the characteristics of strong precipitation are analyzed and the "three calls" standard in Yuqing county is determined. The results show that: for the county, 1 h rainfall of 45 mm or 2 h rainfall of 60 mm can start three class call, 2 h rainfall of 70 mm or 6 h rainfall of 100 mm, can start two class call, 6 h rainfall of 120 mm or 24 h rainfall reaches 140 mm, can start the first class call. For the county city, when the rain intensity reaches 40 mm/h, it can start the three order call; when 1 h rainfall reaches 60 mm or 2 h rainfall reaches 80 mm, it can start class two; 1 h rainfall is 80 mm or 2 h rainfall is up to 100 mm, and the first class should be called. The population settlement area in the county, the hidden danger zone, the small and medium area, the mountain flood prone area, the tourist scenic spot (point) and the large construction area should be listed as the key areas of "three called should" meteorological service. In addition, we should establish a medium and small river calling standard and upstream and downstream joint defense work mechanism to extend the "three calls" meteorological services.