Using the freezing samples and corresponding temperature, wind and relative humidity data of all stations in Yunnan Province from 1951 to 2007, the discriminant of freezing weather was founded by analyzing the generalizing ratios of freezing samples and freezing weather. Applying Cressman objective analysis method, the day-to-day temperature, wind and relative humidity data were interpolated into 1 km 1 km fine-grid from November 1958 to April 2007. In interpolation, meteorological factors changing with altitude was considered and terrain correcting unit was defined by the scanning radius area. On the basis of above works, the refined climate zoning of frozen disaster in Yunnan Province was obtained. The results indicated that: （1）The northeast of Yunnan Province is the most severe area of freezing weather, the northwest is the second severe area, the middle and southeast is lesser area. With the exclusion of higher latitude area, there is not almost freezing weather in southwest of Yunnan Province. （2）The total trend of freezing weather has been decreasing since 1958, especially in seven years of 21st century. Except for the total was above normal in 2005, the total was below normal in other six years. （3）The most severe districts of frozen disaster in Yunnan Province include Zhenxiong, Weixin, Zhaotong, Ludian and Wulianfeng mountainous area of Yongshan of the northeast of Yunnan Province. The second severe districts include the majority of Qujing of the east of Yunnan Province, the higher latitude area of Luxi and Qiubai of the southeast of Yunnan Province and Deqin, Weixi, Gongshan and the mountain area of them of the northwest of Yunnan Province. The other districts of the east and northwest of Yunnan Province are light frozen disaster area. The other districts where had taken place freezing weather are lighter frozen disaster area.