The characterizations of exciton emission in ZnCdTe-ZnTe-MQWs under electric field have been reported in this paper. The changs of the exciton peaks in Zn

0.67

Cd

0.33

Te(6 nm)-ZnTe(6 nm)MQWs is very small

when electric field increases

peak position shifts about 1.5meV to the lower energy side

when voltage increases from 0 to 19V and peak intensity of this sample increases about 15%. In contrast

the n=1 heavy-hole exciton peaks of Zn

0.8

Cd

0.2

Te-ZnTe changed greatly as voltage increased from 6 to 8 V

exciton peak position shifts about 59%. The variation in exciton peak intensities between the two samples have been explained in exciton localization view point. The large shift of Zn

0.8

Cd

0.2

Te-ZnTe MQWs exciton peaks is due to the bigger quantum-confined Stark effect.