Analysis is performed on the features of climatic productivity and the impacts of climate change air temperature and rainfall on agricultural production mainly wheat and rice in the past 50 years in Kunming.Results show that precipitation during Dec. to next Feb. is critical to wheat growth and accumulated temperature of ≥10℃ plays a more important role than rainfall for rice production.The time period when weather disasters restricting agricultural production of Yunnan Province happened is diagnosed with the aid of calculated annual dry and warm indices and it is indicated that the major weather for crops sown in late autumn are drought during Jan. to Feb. and cold from Feb. to April, and for those sown in late spring are drought in May and cold from July to August.