The effect of different phosphorus level on output and quality of banana under the conditions of quantitative N & K₂O application was studied, using the field test method with single factor analysis. The results showed that banana trees, which were planted in plantation with appropriate available phosphorus soil, fertilized by 0.87kg urea, 1.335kg KCl, 2.0kg organic fertilizer, 125.0g magnesium sulfate per plant, sprayed by 0.2% borax solution one time, especially fertilized by 1.165kg calcium superphosphate per plant and N∶P₂O₅∶K₂O = 1.0∶0.35∶2.0, grew fine. There were 3 advantages of this prescription: firstly, banana trees grew faster with their pseudostem much thicker, and number of functional leaves at the harvest were more, harvest time was earlier and shorter, output was higher; simultaneously, the quality and appearance of fruit was much better, for banana became longer and thicker, starch and total sugar content was much higher, and the edibility rate was also a little higher, titratable acid was medium; in addition, the economic efficiency reached to the best, with the net profit attained to 2637.6 RMB /667m² , and the input-output ratio 1∶1.83.