Abstract: Through the experimental study of drip irrigation under plastic film and the randomized block experimental design, the changes of plant height, stem diameter and leaf area index of maize under different plastic film mulching irrigation quota treatments of 4 800 m~3/hm~2（T1）, 4 200 m~3/hm~2（T2） and 3 600 m~3/hm~2（T3） in spring are closely related. The results showed that T2 and T1treatments could maintain high soil water storage when the irrigation quota was 4 200 m~3/hm~2and 4 800 m~3/hm~2respectively, and the water waste of CK treatment was obvious. After the filling stage, the leaf area index of maize decreased gradually with time, and the change range of T2 treatment was the largest. The results show that it is appropriate to control the irrigation quota of film mulched drip irrigation of maize at the silking and flowering stage at about 300 m~3/hm~2.