Food Security and Agricultural Changes in the Course of China's Urbanization

China’s small farmers face increasing challenges because of land and water resource constraints and the effects of climate change.With the strengthened agricultural stimulus policies,poverty reduction and social protection programs,as well as the expanding international food trade,up to now China has achieved food security through small farm agriculture.During intensive economic restructuring,smallholders still coexist with large-sized farms and industrialized agricultural businesses,but are in a vulnerable position in market transactions.Oriented to 2050,China’s agricultural development and food security policies should work to improve domestic market structure,to further release international trade control and to empower smallholders.