The shading net can affect the growth of fruit tree and the development of berry by adjusting the microclimate.Experiments were conducted in Heshuo(Xingjiang)in 2015,using Vitis vinifera L.cv. Cabernet Sauvignon and Vitis vinifera L.cv.Syrah as materials.Treating time was from verasion(August 5 th)to 12 days before harvest(September 5 th).The results showed that:(1)the shading net decreased the daily average temperature,illumination intensity and photosynthetically active radiation,and increased the daily average humidity,effectively improving the microclimate of grapevine growing.(2) The transverse diameter,the vertical diameter and the fruit weight of grape berry treated with shading net were increased.The shading net effectively inhibited the excessive accumulation of sugar and the rapid degradation of organic acids in grape berry,and reduced the alcohol content in wine.The contents of total phenol and tannin were increased,and the contents of total anthocyanin and flavonoid in grape berries and wines were decreased in treatment group.(3)Nine kinds of monomeric anthocyanins were detected in grape and wine with HPLC.Except anthocyanin-3-glucoside,the other 8 kinds of monomeric anthocyanins in Cabernet Sauvignon berry and wine were lower in shading treatment than those in the control,while in Syrah berry and wine,the monomeric anthocyanins were also lower in shading treatment,except dimethoate- 3-coumaroylated glucoside.Due to global warming,this study is helpful to alleviate the problems of rapid ripening of grape berry,and high alcohol content of wine in hot wine regions,and is meaningful to improve the qualities of grape and wine.