Grain supply for Beijing and Tianjin from final phase of the Qing Dynasty to the Minguo Period had had great changes , the major methods about grain supply had changed from state s control into market s regulation, and the Two City s economic relationship had changed.

Agricultural structural adjustment is a core instrument in China s policy on agriculture,as a result of the adjustment,cultivated land transfer is an important cause of grain supply decreasing in China.

Influence of short-term management on ecological environment and regional food security in the Heihe River Basin;

Use of water and land for food security and environmental sustainability;

Actuality and Technological Strategy of Food Security in China;

Analysis of retaining cultivated land and food safety in Guangxi;

Problems of agricultural disasters and food safety during the progress of urbanization in China;

To enhance the productive capacity of cultivated land and secure grain safety;

Dynamic research on regional grain safety;