Abstract: ‘Yu Yi Long Xiang’cucumber was used as the material, the morphological indexes such as plant height, stem diameter, leaf number, dry and fresh weight of cucumber seedlings were measured, and the physiological indexes such as chlorophyll content and carotenoid content were determined.The strong seedling index was calculated.The effects of single application of three fertilizer synergists of diethyl aminoethyl hexanoate, potassium fulvate and sodium α-naphthylacetate and the combination of two and two with hoagland nutrient solution on the growth of cucumber seedlings were studied, in order to provide reference for selecting fertilizer synergists of cucumber.The results showed that the fertilizer synergists had a certain promotion effect on the growth of cucumber seedlings, and the promotion effect of two or two pairs of three fertilizer synergists on the growth of cucumber seedlings was better than that of a single fertilizer synergist.In the compound combination of three fertilizer synergists, the compound combination of 60 mg·kg^-1 potassium fulvate+5 mg·kg^-1 α-naphthylacetic acid sodium had the best promotion effect on the maximum root length, root volume, root dry weight, plant dry weight and strong seedling index of cucumber seedlings, and its strong seedling index was 17.01% higher than that of the control.The results of the analysis of the gray association of 10 indicators were that, the correlation was sorted as r_F＞r_D＞r_E＞r_B＞r_C＞r_A＞r_CK,and the comprehensive order of each processing was F＞D＞E＞B＞C＞A＞CK.