Situation，potential and strategies of grain production in double cropping region of China

The double cropping region is main grain producing area accounting for 53．2％ of the total output in China Since 1985，a large change has taken place in the production situation and structure．Grain output has stable increment in Huanghuai and Jianghuai regions respectively by 47.63％ and 61.67％ and slow increment in Sichuan and Xinan regions respectively by 43．76％ and 10.32％ ．The key regions of grain increase should be Jianghuai and Huanghuai regions and the technological strategies are as follows：high yield fields are main direction and the mid-low ones should be altered；good varieties should be selected and used，raising utilization ratio of water and fertilizer to increase efficiency and decrease cost.