Abstract: An experiment concerning N and K fertilization under water-saving irrigation in grapery was conducted in Yizheng of Jiangsu Province.The results showed that when nitrogen fertilizer is equal to or less than 127.8kg·hm^-2, and K is equal to or less than 165.8 kg·hm^-2, grape yield was increased with the increase in fertilizer rates,the maximum yield increasing percentage with nitrogen and potassium application was 43.4%, 21.6% respectively. The yield was more responsive to N fertilizer than that of K fertilizer.The optimum rate was 127.5kg·hm^-2 for nitrogen, and 163.5kg·hm^-2 for potassium,respectively.Effect of nitrogen fertilizer on sugar content was more complex, within the range of 29.7 kg·hm^-2~100.5kg·hm^-2 glucose degree was positively correlated to the rate of application. The higher the potassium application rate, the higher the sugar degree. The single factor test showed that when available potassium content was over or equal to 205.9 mg·kg^-1, glucose points was reduced less than 5%;while the available K content was higher than 211.8 mg·kg^-1, the relative yield of potassium-free zone was greater than 95%. Soil available potassium content of 215 mg·kg^-1 could be designated as an indicator for the richness of soil available potassium to grape cultivation.