In the past 100 years,the significant temperature rising in the Northern Hemisphere had profoundly influenced the yield,maturity and planting structure of agricultural products. Referring to the climate changes perceived by farmers in Yellow River-Huangshui River Valley and carrying out survey about the planting area of major crops in the local area,corresponding analysis by adopting the Fast Clustering Method was made. The results showed that: in the past 20 years,the proportional structure of the planting area of major crops in Yellow River-Huangshui River Valley changed significantly. The planting area of tubers increased and the planting area of wheat decreased rapidly. Moreover,it was shrinking to the East geographically. The planting area of corn increased significantly and it was expanding to the West and high-altitude regions. To conclude,the planting structure of major crops in Yellow River-Huangshui River Valley was transformed from wheat-tubers to diversified,thermophilic crops as corn-tuberswheat and so on.