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利用黄淮南片水地小麦良种区试和河南省区试、生产示范资料，对GS豫麦21号的丰产性、稳产性和产量结构进行分析。结呆在明：GS豫麦21号具有丰产稳产性好、适应性广、产量构成三要素协调等优良特性，在产量构成三要素中，千粒重对产量的直接作用最大，穗粒数次之，有效穗数的直接作用最小，因此在高产栽培上应在兼顾667m2成穗（40万上下）的基础上，主攻千粒重和穗粒数的增加。
Based on the trial of wheat improved area of Huanghuainan South Watermelon and demonstration and production of Henan Province, the high yield, stable yield and yield structure of GS Yumai 21 were analyzed. Conclusion: GS Yumai 21 has the characteristics of good and stable yield, wide adaptability and the coordination of yield components. Among the three elements of yield composition, the direct effect of 1000-grain weight on the yield is the largest. The effective number of spikes the least direct effect, so in high yield cultivation should take into account the 667m2 into the ear (400,000 up and down), the main thrust of 1000-grain weight and grain number increased.