Global warming in China has shifted the northern limits of crop-growing areas and affected crop yields. By analyzing data from 1950 to 2007, researchers found that the two-cropping system expanded in certain provinces, leading to increased grain yields. Winter wheat areas moved northwards, resulting in higher yields in some regions. The northern limits of double rice cropping also shifted northwards in specific provinces. These changes indicate the impact of climate warming on cropping systems and crop yields in China.