Taking grape variety of ‘Merlot’ as material,through the field experiment,effects of different irrigation amount on the growth and quality of wine grape physiology of drip irrigation under plastic film were studied.The results showed that,in different conditions,with the increasing of irrigation,grape yield increased,when the irrigation amount reached or exceeded the amount of irrigation,grape yield didn’t appear obvious production increase；and mulching could effectively increase the yield of wine grape compared with non-mulching,sugar content increased,the soil moisture could be effectively used to prevent water loss.