Abstract: 【Objective】In order to comprehensively evaluate and recommend the application of the dosage of nitrogen in no-till oilseed field in the low latitude plateau areas, 【Method】the no-till oilseed yield and agronomic characterizes of 10 different nitrogen usage in the 4 different latitude areas during 2013-2015 were compared by using multiple regression analysis and fuzzy cluster analysis. 【Results】The results showed that : (1) the trend of growing period, lodging and powdery mildew increased, and frozen as well as bird damage declined when the usage of nitrogen was increased in the oilseed seedling period; (2) the main characterizes significantly varied among the different dosage of nitrogen, number of effective silique per plant, seed per silique and plant productivity raised with the increasing dosage of nitrogen. Furthermore, the rising thousand-seed weight and prolonged growth period could improve the yield; (3) the yield varied to different degree among the different dosage of nitrogen. 【Conclusion】The optimum usage of nitrogen was 375-525kg/hm2 in the seedling period in the no-till oilseed fields in the low latitude plateau areas by considering high-yield and stability.