Abstract: The climatological observation data, reanalysis data and grain/soybean yields per unit area are used to analyze and interpret the impacts of climate change on grain production in this paper. The results show that Jilin Province is the most remarkably temperature increase area in the growing season (May to September) in the Northern Hemisphere's middle latitudes after 1948. The region of the mid-west and south of Jilin Province and Liaoning Province is a distinctively, linearly decreasing trend area of annual precipitation, where climate change showed a dominant warm/drought trend; but the east of Jilin is a notably linear increase area of annual precipitation. The climate warming played an important role in the persistent increase in grain/soybean yield per unit area since the 1980's in Jilin's main production areas of grain, however, this beneficial function has become greatly weakened, and the grain/soybean yield per unit area starts to oscillate with annual precipitation from the end of 20th to the beginning of 21st centuries.

Key words: Jilin Province, climate change, grain production