Abstract: In order to explore the effects of different fertilization treatments on agronomic traits and yield of plateau Brassia campestris in Guinan County, Beiyou No.4 was used as the test material and 5 treatments were set up to carry out field experiments. The results showed that the lack of nitrogen fertilizer, phosphate fertilizer and potassium fertilizer alone or the lack of three elements at the same time would lead to the decrease of yield and quality of the variety, and from the three elements, the lack of nitrogen caused the largest yield reduction of rape. Therefore, for the local Beiyou No.4 plateau Brassia campestris main cultivar, should pay attention to nitrogen, phosphorus and potassium fertilizer, especially the scientific application of nitrogen fertilizer, in order to improve the yield and quality of Brassia campestris.