Based on the meteorological data from 1971 to 2015 in the western Jilin province, this study explored the variation of major climatic factors. The yield potential of hybrids with different GDD(growing degree day) were estimated using Hybrid-Maize model. The results showed that the annual variation of temperature, precipitation and sunshine hours were similar to those in growing season, the variation ranges in growing season were different from the annual average. The points of growing season mutation were different, temperature and precipitation had hysteresis, and the sunshine hours had advancement. The increasing of the temperature in growing season was higher than that of the whole year. The abrupt change is 10 years after the annual average. The long-term annual average precipitation is more volatile, and the precipitation in the growing season appears a clear upward trend. And since 2010,the growing season were the relatively humid phase. The decreasing of sunshine hours in the growing season is slower than the annual average. When seeding on April 30 with 60 000 plant/ha, the relatively long maturity hybrids are recommended for Qian' an, Taonan, Qianguo and the relatively short maturity hybrids are recommended for Fuyu, Zhenlai. Adjusting the R/V closed to 1.0 in Taonan, Fuyu, Qianguo, and higher than 1.15 in Zhenlai and Qian' an.