Abstract: The study is to provide scientific base for fine quality and high yield of weak-gluten wheat with proper application of nitrogen fertilizer. It employed weak-gluten Ningmai 9 to study the effects of nitrogen dressing ratios on its population structure and grain yield. The results indicated that the grain yield, the spike rate, the max leaf area index (LAI), biomass at maturity and post-anthesis dry matter accumulation showed conic relation with nitrogen rates on the jointing stage. The spike number, the spike rate, the max LAI, biomass at maturity and post-anthesis dry matter accumulation were significantly correlated with the grain yield. The optimal nitrogen application scheme in weak-gluten wheat Ningmai 9 with the grain yield of over 6100kg/hm2 was on the condition of the 225kg/hm2 nitrogen application, the 6:4 and 5:5 dressing ratios and topdressing during the jointing stage. This population was an efficient one and its quality indexes were more equitable. The corresponding indexes were 477~486×104/hm2 of spike number, 48.6~48.9% of spike rate, 6.92~7.08 of the max LAI, 14460~15330kg/hm2 biomass at maturity and 4455~4515kg/hm2 of post-anthesis dry matter accumulation.