In order to find the best inflection point of fertilizer water coupling parabola and determine the best technical parameters of fertilizer water coupling for local facilities cucumber， 5 different drip fertilization modes were set up with conventional drip irrigation amount as quota， including T1(CK)， T2， T3， T4 and T5.The results showed that the plant growth and yield factors， such as plant height， single melon weight， strip length， single plant yield and number of fruit per plant， the quality characteristics of vitamin C， soluble sugar， total nitrogen， total phosphorus， total potassium， nitrate， nitrite， water production efficiency and fertilization agronomic efficiency were all lower than those of the fixed drip irrigation treatment， and two different varieties and five treatments were applied with high efficiency and the coupling law of fertilizer tended to be the same， and the general trend was T3 > T4 > T2 > T5 > T1( CK). T3 showed the best performance， while T1 (CK) showed the weakest performance.With the increase of the amount of drip fertilizer， the growth factor， quality factor and benefit evaluation factor all appeared the parabola peak inflection point in T3， which indicated that the optimal growth potential， yield， quality and benefit could be produced by adopting the coupling technology of drip fertilization under the condition of constant drip irrigation.