Spatial and temporal variations of spring frost are identified based on the historical measurements from 35 meteorological stations in Jiangsu Province from 1961 to 2008.Then,using the climate data projected by models in "WCRP" coupled model intercomparison program-phase 3,the future trend of spring frost is analyzed under different climate conditions.Results show that,in recent 48 years,the date of final spring frost come earlier significantly in Jiangsu Province.Meanwhile,the days of spring frost decrease markedly.Both the date of final spring frost and the days of spring frost change abruptly in the late 1990s.Future global climate change will considerably cause the date of final spring frost to end earlier.Compared with the average date from 1961 to 1999,the date of final spring frost will be 4.6—9.6 d and 14.6—17.7 d earlier in 2020s and 2060s under the condition of moderate emission(A1B),7.3—11.3 d and 12.8—16.5 d earlier in 2020s and 2060s under the condition of high emission(A2),and 5.3—10.2 d and 9.4—14.2 d earlier in 2020s and 2060s under the condition of low emission(B1),respectively.