Using three factors(nitrogen,phosphorus and potassium) four levels experimental design,the three concentrations of nitrogen，phosphorus，potassium nutrition on Phalaenopsisseedlings growth were studied.The results showed that nitrogen concentration of 250 mg/L，the phosphorus concentration of 15 mg/L，potassium concentration of 150 mg/L on the Phalaenopsis seedlings growth and leaf area growth was more suitable.High phosphorus concentration (60 mg/L)，the seedlings growth rate of leaf length，leaf width and leaf area were reduced；High nitrogen concentration (350 mg/L) result in slender weak leaves and lower the seedlings growth rate of leaf length，leaf width and leaf area；High potassium (250 mg/L) contribute to the dry matter accumulation and high area growth rate of seedlings leaf.The growth rate of leaf area and leaf width had a significant positive correlation.Fertilization could contribute to enlarge growth rate of leaf width and to improve the growth rate of leaf area.