Abstract: To prove the influence of sowing date on dry matter and nutrient accumulation of Brassica napus, a field trail with early sowing (September 15), middle sowing (September 30) and late sowing (October 15) treatments was conducted to study the dry matter and nutrient accumulation patterns of Zhongshuang11. Our results showed that sowing date had an influence on growth progress of rapeseed. The whole growing period length of rapeseed was decreased with postponed sowing date. The rapeseed had the highest yield (2032 kg/hm²) under middle sowing date, 38.3% and 61.4% higher than early and late sowing treatments. The three sowing date rapeseed reached the maximum dry matter at blooming, podding and mature period respectively. The N, K contents of root and shoot were influenced more significantly by sowing date than P content. Nitrogen and K contents of late sowing rapeseed were much higher than early and middle sowing rapeseed at early growth stage. Phosphorus content of early sowing rapeseed was lower than middle and late sowing treatments. The N, P, K accumulation patterns (except P accumulation patterns of middle sowing rapeseed which reached the maximum at mature period) of each sowing rapeseed were changed similarly to the change of dry matter accumulation. It will provide theoretical basis for choosing suitable sowing date to understand the different accumulation patterns of dry matter and nutrient between three sowing treatments.