In order to study the effect of amino acid selenium liquid fertilizer,the Zhongyou 4(Nectarine)and Chunxue(peach)of 4 years old were used as materials.The results showed that application of selenium amino acid liquid fertilizer could significantly increase palisade tissue thickness,leaf thickness,specific leaf weight and improve the leaves quality of peach.It could promote the synthesis of chlorophyll and carotenoid,enhance net photosynthetic rate.The net photosynthetic rate were 122 to 150 times compared to the control.It could significantly increase the yield.The yield were 2836 t/hm2 to 8145 t/hm2 higher than that of the control.It markedly increased soluble solid content,total soluble sugar and sugar acid ratio,it could improve fruit quality,also increase the content of Vc and selenium and the activity SOD,increase the nutrition and health quality of fruits.In general,compared with soil dressing,spraying amino acid selenium liquid fertilizer was better and economy.