Yunnan Province is the bridgehead for the opening of the southwest region in China,and the economic frontier of China-ASEAN economic cooperation,where the export of agricultural products plays an important role in promoting the openness of the southwest region and strengthening China-ASEAN economic cooperation.In this paper,we use CMS model to analyze causes of the increase in the exports of agricultural products in Yunnan Province during the period 2001-2010.It is found that the expanded import scale of agricultural products in the world,improvement in the export competitiveness of products and the adaption of product export structure to the changes in the structure of world import demand,are the main factors responsible for increase in the exports of agricultural products in Yunnan Province.In recent years, the improvement of competitiveness of the export of agricultural products becomes a key factor for the growth of the export of agricultural products in Yunnan Province.In terms of the products classified,strong export competitiveness has promoted the export of plant products,such as beverages and tobacco,while weak export competitiveness and unreasonable export structure has impeded the export of animal products,plant and animal oil and fat products. Yunnan Province is the bridgehead for the opening of the southwest region in China, and the economic frontier of China-ASEAN economic cooperation, where the export of agricultural products plays an important role in promoting the openness of the southwest region and strengthening China-ASEAN economic cooperation. this paper, we use CMS model to analyze causes of the increase in the exports of agricultural products in Yunnan Province during the period 2001-2010. It is found that the expanded import scale of agricultural products in the world, improvement in the export competitiveness of products and the adaption of product export structure to the changes in the structure of world import demand, are the main factors responsible for increase in the exports of agricultural products in Yunnan Province.In recent years, the improvement of competitiveness of the export of agricultural products becomes a key factor for the growth of the export of agricultural products in Yunnan Province. terms of the products classified, strong export competitiveness has promoted the export of plant products, such as beverages and tobacco, while weak export competitiveness and unreasonable export structure has impeded the export of animal products, plant and animal oil and fat products.