Under the condition of lack of magnesium,effects of magnesium application on the mineral nutrition absorption of grape were studied to explore the relationship between magnesium application and nutrients contents of leaves and grape fruits,in order to provide reference basis for formulating rational fertilization technique of grape.A field experiment with a split plot design was conducted,four soil applying gradients of 0,112.5,150,187.5 kg/hm2 were set up in the main area,while in deputy district three concentrations of foliar spraying were set up,respectively was 0%,0.2%,0.4%,mineral element contents in leaves and fruits were measured.The results showed that magnesium supplement significantly increased the magnesium content of grape leaves and fruit,and promoted the absorption of potassium,calcium and manganese,but reduced the zinc content in the leaves and fruit,and there was no significant effect on iron and copper.When soil applying 150 kg/hm2 and foliar spraying 0.4% magnesium fertilizer,the magnesium,potassium,iron,manganese contents in the blade were appropriate,while calcium was high,zinc was in low level but could meet the need of grapes,spikelets and fruit weight were the largest.It was concluded that magnesium application under soil applying 150 kg/hm2 and foliar spraying 0.4% was the best.