The regularity of climate change during the growing period of spring rape is analyzed, taking the Mengyuan county as an example. The result shows that the temperature is rising during the growing period of spring rape in Mengyuan, and precipitation is dropping at a rate of 1.64 of 20.70 mm per 10 years from April to August and rising at a rate of 20.16 mm per 10 years in September. The climate warming advances the seeding date and the mature stage of spring rape, lengthens the growth season, improves the use efficiency of climate resources, and enhances the output per unit in average. The influence of climate warming at each growth stage varies, and all growth stages are postponed except the seedling stage. The climatic yields are influenced mainly by temperature of April and June, annual mean temperature, and precipitation of June.