Rapeseed is a fertilized and fat-tolerant crop. For every 100 kg of Brassica napus L., 8.8 to 11.3 kg of pure nitrogen, 3.0 to 3.9 kg of pure phosphorus , and 8.5 to 12.7 kg of potassium are required . According to this ratio, the best fertilization scheme in the north is: 10 kg of rapeseed long-acting compound fertilizer plus 30 kg of diammonium sulfate plus 4.5 kg of urea , and the ratio of nitrogen, phosphorus and potassium is 1 : 0.71 to 0.24 . Brassica napus L. should adopt the lateral deep fertilization technique, using two-thirds of the total fertilizer as the base fertilizer, and applying the lateral depth to the seed 4 to 5 cm, and the remaining one third is used as the seed fertilizer and seed mixing. It is best to avoid burning seedlings caused by large amount of one-time fertilization and prevent post-fertilization. In the fertilization type, the combination of micro-fertilizer, seed fertilizer and staged fertilization is combined to meet the nutrient demand of rapeseed during the whole growth period. In the fertilization time, the foliar fertilizer should be supplemented during the bud period, and the boron fertilizer should be supplemented during the flowering period to increase the seed setting rate. The method of application per hectare is generally 16% efficient instant boron thousand gram potassium dihydrogen phosphate 1.2 3 kg.