Institute of Agricultural Information Chinese Academy of Agricultural Sciences Beijing 100081 China;
Institute of Agricultural Information Chinese Academy of Agricultural Sciences Beijing 100081 China;
Institute of Agricultural Information Chinese Academy of Agricultural Sciences Beijing 100081 China;
School of Agriculture and Food Sciences the University of Queensland Brisbane 4072 Australia;
Institute of Agricultural Information Chinese Academy of Agricultural Sciences Beijing 100081 China;
Institute of Agricultural Information Chinese Academy of Agricultural Sciences Beijing 100081 China;
Data envelopment analysis; Farming efficiency; Influencing factor; Scale farm;