【Objective】 The sugar-nitrogen characteristics of wheat at yield level of 9 000 kg·hm-2following rice were studied. In addition, the sugar-nitrogen nutrition diagnosis indexes for wheat at yield level of 9 000 kg·hm-2were suggested. 【Method】 Wheat populations at two different yield levels in rice-wheat rotation, including <9 000 kg·hm-2population(hereinafter as HY) and ≥9 000 kg·hm-2population(hereinafter as SHY), were established by agronomic management of the medium-gluten wheat, Yangmai 20(Triticum aesti...