Different nitrogen physiological efficiency oilseed rape were used as experiment materials,the relationship between nitrogen distribution in different organs and nitrogen physiological efficiency were studied under the normal nitrogen supply with 15N trace method.High nitrogen physiological efficiency variety(742) compared with low nitrogen physiological efficiency variety(Huiyou50),it was showed that,nitrogen distribution proportion in leaves and seeds are larger;nitrogen distribution proportion in husk of siquilin are smaller and the amou...