Vegetable and oilseed rape is an important way to develop the multi-functional use of oilseed rape and improve the production efficiency. The reasonable application of nitrogen (N) fertilizer is an important nutrient guarantee for crop production. so it is important to clarify the suitable amount of N fertilizer for the basal application of vegetable and oilseed rape and the effect of topdressing N fertilizer，so as to provide a reference for the scientific application of N fertilizer.Field fertilization experiments were carried out in 2022—2023 in Wuxue city and Shayang county，Hubei Province，with the main treatment of stalk-free and stalk-cut，and the sub-treatment of basal N fertilizer rate (0，90，135，180，225，270，315 kg·hm-2)，and a cleavage zone was set up for each treatment (half without topdressing，half with topdressing N fertilizer of 45 kg·hm-2)，to study the effect of different basal N fertilizer rate on the yield of rapes stalk，the effect of cutting stalk or not，and the effect of basal N fertilizer rate on rapeseed yield and its component factors，the effect of yield after topdressing，and the N accumulation and N benefits were analyzed.The yields of rape stalk and rapeseed increased with the increase of basal N fertilizer rate，and the yields of rape stalk reached the plateau values at Wuxue and Shayang points when the N fertilizer rates were 246 and 221 kg·hm-2，respectively.When no topdressing，the yield of stalk-free rape reached the plateau values of 2911 and 2975 kg·hm-2 when the N fertilizer rate was 230 and 238 kg·hm-2，and the yield of rape-cut rape reached the plateau values of 1789 and 1997 kg·hm-2 when the N fertilizer rate was 218 and 213 kg·hm-2，and the N fertilizer required for stalk-cut rape was slightly lower than that for stalk-free rape，but the yields were significantly decreased by 38.5%，32.9%，respectively.Compared with no topdressing，the platform yield of stalk-free rape increased by 5.9% and 7.8%，and the platform yield of stalk-cut rape increased by 12.3% and 4.6% when topdressing，respectively.The yields of stalk-free and stalk-cut rapeseed were mainly contributed by primary branch yields，and the increase in N fertilizer rate mainly promoted the number of pods and hence yield in the primary branch of stalk-free rapeseed and the secondary branch of stalk-cut rapeseed.The analysis of N accumulation showed that the N accumulation of rape stalk accounted for 22.6% of the whole life span of stalk-cut rape，and the N accumulation of seed and non-seed parts of rapeseed increased with the increase of N fertilizer rate，and further increase the N accumulation of rapeseed when topdressing fertilizer.The analysis of N benefit showed that harvesting one season of rape stalk could earn 20998 Yuan·hm-2，and although cutting stalk of rape reduced the output value of rapeseed，the overall benefit was significantly higher than that of stalk-free rape，and the N benefit increased by an average of 103.6% and 94.2%，respectively，under the conditions of no topdressing fertilizer and topdressing fertilizer.Ensuring appropriate N application was important for securing rapeseed yields，and over-fertilization had no significant effect on yield improvement.Regardless of whether N was applied or not，cutting stalk of rape would reduce rapeseed yield，but the N benefit of vegetable and oilseed rape rapeseed was significantly higher than that of conventional rapeseed.In conclusion，the N demand of vegetable and oilseed rape was slightly lower than that of conventional rapeseed，it was recommended that the suitable basal application of N fertilizer for vegetable and oilseed rape should be 220 kg·hm-2，and topdressing N fertilizer of 45 kg·hm-2 after cutting the stalk of rape，which could synergistically improve the yield and benefits.