Abstract: Cauliflower is one of the main vegetable cultivars planted in Yongchun County. In this paper, a field test on fertilization effect and suitable amounts of nitrogen, phosphorus and potassium on cauliflower was carried out by using “3414” experimental design method. The results showed that the economic yields of cauliflower could increase by 179.8%, 74.7% and 122.3% respectively by applying suitable amounts of nitrogen, phosphorus and potassium. And under this experimental conditions, the adequate fertilization amounts of N, P₂O₅ and K₂O were15.7~20.7 kg/667 m² (235.5~310.5 kg/hm²), 4.9~8.1 kg/667 m² (73.5~121.5 kg/hm²) and 11.0~16.1 kg/667 m² (165~241.5 kg/hm²) respectively, the suitable ratio of three essential factors was 1∶0.6∶0.4.