Abstract:On the basis of the lowest temperature data from 1971 to 2005 in Jianyang of Fujian Province, the mathematical model of extreme values distribution was constructed, and the self-mortality temperature of Eucalyptus dunnii was determined by conductivity. The lowest temperatures were forecasted as -7.47℃, -7.47~-8.5℃ and 8.68℃ in 0~5 years, 5~10 years and over 10 years, respectively. The extreme low-temperature distribution method of cold resistance was put forward for the first time, which combined the extreme lowest-temperature distribution model with conductivity. The method could widely used in quantitative evaluation and individual selection of the cold resistance for different species and areas.