Abstract: The objective is to explore the moisture change of ear cob, kernel, bract and ear stem of maize at milk stage.‘Xianyu696’and‘Heyu29’with the same growth period and different kernel dehydration rates at milk stage were used as materials. The moisture contents of ear cob, bract and kernel at milk stage were detected with drying weight reduction method, the change contents at different stages were also determined. The moisture change in ear stem was detected with moisture absorption method. The results showed that the dehydration rate of different varieties had the same trend: bract＞kernel＞cob,‘Xianyu696’＞‘Heyu29’. ‘Xianyu696’(the fast dehydration) showed that water traffic volume gradually decreased from stalk to ear along with the growth period going on. The moisture content of bract decreased quickly at the earlier stage, and the moisture content of kernel decreased quickly.‘Heyu29’(the slow dehydration) showed that water traffic volume was higher than that of‘Xianyu696’from stalk to ear, the carrying capacity did not change. The moisture of bract and kernel decreased slowly. We also found that kernel dehydration was related to the dehydration rate of bract and ear stem. After the physiological maturity of kernels, the water did not flow from ear to stalk in the natural dehydration process. The carrying capacity and variation of different varieties were different (the difference was not significant).